[Commits] 5dbdc2c: MDEV-23619 MariaDB crash on WITH RECURSIVE UNION ALL (CTE) query
by IgorBabaev 11 Nov '20
by IgorBabaev 11 Nov '20
11 Nov '20
revision-id: 5dbdc2ce52afba017b98f7326754197e4bbc0920 (mariadb-10.2.31-561-g5dbdc2c)
parent(s): c7902186129cae888c45a87150d33059528a7033
author: Igor Babaev
committer: Igor Babaev
timestamp: 2020-11-10 16:01:30 -0800
message:
MDEV-23619 MariaDB crash on WITH RECURSIVE UNION ALL (CTE) query
Due to a premature cleanup of the unit that specified a recursive CTE
used in the second operand of union the server fell into an infinite
loop in the reported test case. In other cases this premature cleanup
could cause other problems.
The bug is the result of a not quite correct fix for MDEV-17024. The
unit that specifies a recursive CTE has to be cleaned only after the
cleanup of the last external reference to this CTE. It means that
cleanups of the unit triggered not by the cleanup of a external
reference to the CTE must be blocked.
Usage of local table chains in selects to get exeternal references to
recursive CTEs was not correct either because of possible merges of
some selects.
Also fixed a minor bug in st_select_lex::set_explain_type() that caused
typing 'RECURSIVE UNION' instead of 'UNION' in EXPLAIN output for external
references to a recursive CTE.
---
mysql-test/r/cte_recursive.result | 229 +++++++++++++++++++++++++++++++++++++-
mysql-test/t/cte_recursive.test | 50 +++++++++
sql/sql_lex.cc | 8 +-
sql/sql_select.cc | 5 +-
sql/sql_union.cc | 42 +++----
5 files changed, 309 insertions(+), 25 deletions(-)
diff --git a/mysql-test/r/cte_recursive.result b/mysql-test/r/cte_recursive.result
index 6404931..85883d3 100644
--- a/mysql-test/r/cte_recursive.result
+++ b/mysql-test/r/cte_recursive.result
@@ -1301,7 +1301,7 @@ select ancestors.name, ancestors.dob from ancestors;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived4> ALL NULL NULL NULL NULL 24
4 DERIVED folks ALL NULL NULL NULL NULL 12 Using where
-6 RECURSIVE UNION <derived3> ALL NULL NULL NULL NULL 12
+6 UNION <derived3> ALL NULL NULL NULL NULL 12
5 RECURSIVE UNION <derived4> ALL NULL NULL NULL NULL 24
NULL UNION RESULT <union4,6,5> ALL NULL NULL NULL NULL NULL
3 DERIVED folks ALL NULL NULL NULL NULL 12 Using where
@@ -3964,5 +3964,232 @@ YEAR d1 d2
DROP PROCEDURE p;
DROP TABLE t1,t2,t3,t4;
#
+# MDEV-23619: recursive CTE used only in the second operand of UNION
+#
+create table t1 (
+a bigint(10) not null auto_increment,
+b int(5) not null,
+c bigint(10) default null,
+primary key (a)
+) engine myisam;
+insert into t1 values
+(1,3,12), (2,7,15), (3,1,3), (4,3,1);
+explain with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
+2 DERIVED s ALL NULL NULL NULL NULL 4
+3 RECURSIVE UNION t1 ALL NULL NULL NULL NULL 4 Using where
+3 RECURSIVE UNION <derived2> ref key0 key0 8 test.t1.c 2
+NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
+4 UNION <derived2> ALL NULL NULL NULL NULL 4
+with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t;
+b
+0
+3
+7
+1
+3
+analyze format=json with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t;
+ANALYZE
+{
+ "query_block": {
+ "union_result": {
+ "table_name": "<union1,4>",
+ "access_type": "ALL",
+ "r_loops": 0,
+ "r_rows": null,
+ "query_specifications": [
+ {
+ "query_block": {
+ "select_id": 1,
+ "table": {
+ "message": "No tables used"
+ }
+ }
+ },
+ {
+ "query_block": {
+ "select_id": 4,
+ "r_loops": 1,
+ "r_total_time_ms": "REPLACED",
+ "table": {
+ "table_name": "<derived2>",
+ "access_type": "ALL",
+ "r_loops": 1,
+ "rows": 4,
+ "r_rows": 4,
+ "r_total_time_ms": "REPLACED",
+ "filtered": 100,
+ "r_filtered": 100,
+ "materialized": {
+ "query_block": {
+ "recursive_union": {
+ "table_name": "<union2,3>",
+ "access_type": "ALL",
+ "r_loops": 0,
+ "r_rows": null,
+ "query_specifications": [
+ {
+ "query_block": {
+ "select_id": 2,
+ "r_loops": 1,
+ "r_total_time_ms": "REPLACED",
+ "table": {
+ "table_name": "s",
+ "access_type": "ALL",
+ "r_loops": 1,
+ "rows": 4,
+ "r_rows": 4,
+ "r_total_time_ms": "REPLACED",
+ "filtered": 100,
+ "r_filtered": 100
+ }
+ }
+ },
+ {
+ "query_block": {
+ "select_id": 3,
+ "r_loops": 1,
+ "r_total_time_ms": "REPLACED",
+ "table": {
+ "table_name": "t1",
+ "access_type": "ALL",
+ "r_loops": 1,
+ "rows": 4,
+ "r_rows": 4,
+ "r_total_time_ms": "REPLACED",
+ "filtered": 100,
+ "r_filtered": 100,
+ "attached_condition": "t1.c is not null"
+ },
+ "table": {
+ "table_name": "<derived2>",
+ "access_type": "ref",
+ "possible_keys": ["key0"],
+ "key": "key0",
+ "key_length": "8",
+ "used_key_parts": ["a"],
+ "ref": ["test.t1.c"],
+ "r_loops": 4,
+ "rows": 2,
+ "r_rows": 0.5,
+ "r_total_time_ms": "REPLACED",
+ "filtered": 100,
+ "r_filtered": 100
+ }
+ }
+ }
+ ]
+ }
+ }
+ }
+ }
+ }
+ }
+ ]
+ }
+ }
+}
+prepare stmt from "with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t";
+execute stmt;
+b
+0
+3
+7
+1
+3
+execute stmt;
+b
+0
+3
+7
+1
+3
+deallocate prepare stmt;
+#checking hanging cte that uses a recursive cte
+explain with h_cte as
+( with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t)
+select * from t1 as tt;
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY tt ALL NULL NULL NULL NULL 4
+with h_cte as
+( with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t)
+select * from t1 as tt;
+a b c
+1 3 12
+2 7 15
+3 1 3
+4 3 1
+analyze format=json with h_cte as
+( with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t)
+select * from t1 as tt;
+ANALYZE
+{
+ "query_block": {
+ "select_id": 1,
+ "r_loops": 1,
+ "r_total_time_ms": "REPLACED",
+ "table": {
+ "table_name": "tt",
+ "access_type": "ALL",
+ "r_loops": 1,
+ "rows": 4,
+ "r_rows": 4,
+ "r_total_time_ms": "REPLACED",
+ "filtered": 100,
+ "r_filtered": 100
+ }
+ }
+}
+prepare stmt from "with h_cte as
+( with recursive r_cte as
+( select * from t1 as s
+union
+select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t)
+select * from t1 as tt";
+execute stmt;
+a b c
+1 3 12
+2 7 15
+3 1 3
+4 3 1
+execute stmt;
+a b c
+1 3 12
+2 7 15
+3 1 3
+4 3 1
+deallocate prepare stmt;
+drop table t1;
+#
# End of 10.2 tests
#
diff --git a/mysql-test/t/cte_recursive.test b/mysql-test/t/cte_recursive.test
index d190458..082e9be 100644
--- a/mysql-test/t/cte_recursive.test
+++ b/mysql-test/t/cte_recursive.test
@@ -2641,5 +2641,55 @@ DROP PROCEDURE p;
DROP TABLE t1,t2,t3,t4;
--echo #
+--echo # MDEV-23619: recursive CTE used only in the second operand of UNION
+--echo #
+
+create table t1 (
+ a bigint(10) not null auto_increment,
+ b int(5) not null,
+ c bigint(10) default null,
+ primary key (a)
+) engine myisam;
+insert into t1 values
+ (1,3,12), (2,7,15), (3,1,3), (4,3,1);
+
+let $q=
+with recursive r_cte as
+( select * from t1 as s
+ union
+ select t1.* from t1, r_cte as r where t1.c = r.a )
+select 0 as b FROM dual union all select b FROM r_cte as t;
+
+eval explain $q;
+eval $q;
+--source include/analyze-format.inc
+eval analyze format=json $q;
+eval prepare stmt from "$q";
+execute stmt;
+execute stmt;
+deallocate prepare stmt;
+
+--echo #checking hanging cte that uses a recursive cte
+let $q1=
+with h_cte as
+( with recursive r_cte as
+ ( select * from t1 as s
+ union
+ select t1.* from t1, r_cte as r where t1.c = r.a )
+ select 0 as b FROM dual union all select b FROM r_cte as t)
+select * from t1 as tt;
+
+eval explain $q1;
+eval $q1;
+--source include/analyze-format.inc
+eval analyze format=json $q1;
+eval prepare stmt from "$q1";
+execute stmt;
+execute stmt;
+deallocate prepare stmt;
+
+drop table t1;
+
+--echo #
--echo # End of 10.2 tests
--echo #
diff --git a/sql/sql_lex.cc b/sql/sql_lex.cc
index e1e3073..77e6b2b 100644
--- a/sql/sql_lex.cc
+++ b/sql/sql_lex.cc
@@ -4450,9 +4450,11 @@ void st_select_lex::set_explain_type(bool on_the_fly)
/*
pos_in_table_list=NULL for e.g. post-join aggregation JOIN_TABs.
*/
- if (tab->table && tab->table->pos_in_table_list &&
- tab->table->pos_in_table_list->with &&
- tab->table->pos_in_table_list->with->is_recursive)
+ if (!(tab->table && tab->table->pos_in_table_list))
+ continue;
+ TABLE_LIST *tbl= tab->table->pos_in_table_list;
+ if (tbl->with && tbl->with->is_recursive &&
+ tbl->is_with_table_recursive_reference())
{
uses_cte= true;
break;
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 3b09009..82ff4d3 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -12275,6 +12275,9 @@ void JOIN::join_free()
for (tmp_unit= select_lex->first_inner_unit();
tmp_unit;
tmp_unit= tmp_unit->next_unit())
+ {
+ if (tmp_unit->with_element && tmp_unit->with_element->is_recursive)
+ continue;
for (sl= tmp_unit->first_select(); sl; sl= sl->next_select())
{
Item_subselect *subselect= sl->master_unit()->item;
@@ -12292,7 +12295,7 @@ void JOIN::join_free()
/* Can't unlock if at least one JOIN is still needed */
can_unlock= can_unlock && full_local;
}
-
+ }
/*
We are not using tables anymore
Unlock all tables. We may be in an INSERT .... SELECT statement.
diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 8b1719c..9a16237 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -1370,13 +1370,7 @@ bool st_select_lex_unit::cleanup()
{
DBUG_RETURN(FALSE);
}
- /*
- When processing a PS/SP or an EXPLAIN command cleanup of a unit can
- be performed immediately when the unit is reached in the cleanup
- traversal initiated by the cleanup of the main unit.
- */
- if (!thd->stmt_arena->is_stmt_prepare() && !thd->lex->describe &&
- with_element && with_element->is_recursive && union_result)
+ if (with_element && with_element->is_recursive && union_result)
{
select_union_recursive *result= with_element->rec_result;
if (++result->cleanup_count == with_element->rec_outer_references)
@@ -1554,27 +1548,31 @@ bool st_select_lex::cleanup()
if (join)
{
+ List_iterator<TABLE_LIST> ti(leaf_tables);
+ TABLE_LIST *tbl;
+ while ((tbl= ti++))
+ {
+ if (tbl->is_recursive_with_table() &&
+ !tbl->is_with_table_recursive_reference())
+ {
+ /*
+ If query is killed before open_and_process_table() for tbl
+ is called then 'with' is already set, but 'derived' is not.
+ */
+ st_select_lex_unit *unit= tbl->with->spec;
+ error|= (bool) error | (uint) unit->cleanup();
+ }
+ }
DBUG_ASSERT((st_select_lex*)join->select_lex == this);
error= join->destroy();
delete join;
join= 0;
}
- for (TABLE_LIST *tbl= get_table_list(); tbl; tbl= tbl->next_local)
- {
- if (tbl->is_recursive_with_table() &&
- !tbl->is_with_table_recursive_reference())
- {
- /*
- If query is killed before open_and_process_table() for tbl
- is called then 'with' is already set, but 'derived' is not.
- */
- st_select_lex_unit *unit= tbl->with->spec;
- error|= (bool) error | (uint) unit->cleanup();
- }
- }
for (SELECT_LEX_UNIT *lex_unit= first_inner_unit(); lex_unit ;
lex_unit= lex_unit->next_unit())
{
+ if (lex_unit->with_element && lex_unit->with_element->is_recursive)
+ continue;
error= (bool) ((uint) error | (uint) lex_unit->cleanup());
}
inner_refs_list.empty();
@@ -1594,8 +1592,12 @@ void st_select_lex::cleanup_all_joins(bool full)
join->cleanup(full);
for (unit= first_inner_unit(); unit; unit= unit->next_unit())
+ {
+ if (unit->with_element && unit->with_element->is_recursive)
+ continue;
for (sl= unit->first_select(); sl; sl= sl->next_select())
sl->cleanup_all_joins(full);
+ }
DBUG_VOID_RETURN;
}
1
0
[Commits] bea84ae: MDEV-23811: With large number of indexes optimizer chooses an inefficient plan
by IgorBabaev 09 Nov '20
by IgorBabaev 09 Nov '20
09 Nov '20
revision-id: bea84aefb0563a10a310ea81d46c372919345c10 (mariadb-10.2.35-5-gbea84ae)
parent(s): 1404f3bea796c8479cf401cb36d518658600ddca
author: Igor Babaev
committer: Igor Babaev
timestamp: 2020-11-09 13:51:32 -0800
message:
MDEV-23811: With large number of indexes optimizer chooses an inefficient plan
This bug could manifest itself for a query with WHERE condition containing
top level OR formula such that each conjunct contained a single-range
condition supported by the same index. One of these range conditions must
be fully covered by another range condition that is used later in the OR
formula. Additionally at least one of these condition should be ANDed with
a sargable range condition supported by a different index.
There were several attempts to fix related problems for OR conditions after
the backport of range optimizer code from MySQL (commit
0e19f3e36f7842583feb6bead2c2600cd620bced). Unfortunately the first of these
fixes contained typo remained unnoticed until recently. This typo bug led
to rejection of valid range accesses. This patch fixed this typo bug.
The fix revealed another two bugs: one in a constructor for SEL_ARG,
the other in the function tree_or(). Both are fixed in this patch.
---
mysql-test/r/range.result | 72 +++++++++++++++++++++++++
mysql-test/r/range_mrr_icp.result | 72 +++++++++++++++++++++++++
mysql-test/r/range_vs_index_merge_innodb.result | 2 +-
mysql-test/t/range.test | 42 +++++++++++++++
sql/opt_range.cc | 10 ++--
5 files changed, 194 insertions(+), 4 deletions(-)
diff --git a/mysql-test/r/range.result b/mysql-test/r/range.result
index b332460..9ea0dc1 100644
--- a/mysql-test/r/range.result
+++ b/mysql-test/r/range.result
@@ -3087,5 +3087,77 @@ set max_session_mem_used=@tmp_24117;
deallocate prepare s;
drop table t0,t1,t2;
#
+# MDEV-23811: Both disjunct of WHERE condition contain range conditions
+# for the same index such that the second range condition
+# fully covers the first one. Additionally one of the disjuncts
+# contains a range condition for the other index.
+#
+create table t1 (
+pk int primary key auto_increment, a int, b int,
+index idx1(a), index idx2(b)
+);
+insert into t1(a,b) values
+(5,50), (1,10), (3,30), (7,70), (8,80), (4,40), (2,20), (6,60);
+insert into t1(a,b) select a+10, b+100 from t1;
+insert into t1(a,b) select a+20, b+200 from t1;
+insert into t1(a,b) select a+30, b+300 from t1;
+insert into t1(a,b) select a,b from t1;
+analyze table t1;
+Table Op Msg_type Msg_text
+test.t1 analyze status OK
+explain select * from t1 where ((a between 3 and 4) and b < 100) or (a between 2 and 5);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where
+select * from t1 where ((a between 3 and 4) and b < 100) or (a between 2 and 5);
+pk a b
+7 2 20
+71 2 20
+3 3 30
+67 3 30
+6 4 40
+70 4 40
+1 5 50
+65 5 50
+explain select * from t1 where (a between 2 and 5) or ((a between 3 and 4) and b < 100);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where
+select * from t1 where (a between 2 and 5) or ((a between 3 and 4) and b < 100);
+pk a b
+7 2 20
+71 2 20
+3 3 30
+67 3 30
+6 4 40
+70 4 40
+1 5 50
+65 5 50
+explain select * from t1 where (a between 3 and 4) or ((a between 2 and 5) and b < 100);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where
+select * from t1 where (a between 3 and 4) or ((a between 2 and 5) and b < 100);
+pk a b
+7 2 20
+71 2 20
+3 3 30
+67 3 30
+6 4 40
+70 4 40
+1 5 50
+65 5 50
+explain select * from t1 where ((a between 2 and 5) and b < 100) or (a between 3 and 4);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where
+select * from t1 where ((a between 2 and 5) and b < 100) or (a between 3 and 4);
+pk a b
+7 2 20
+71 2 20
+3 3 30
+67 3 30
+6 4 40
+70 4 40
+1 5 50
+65 5 50
+drop table t1;
+#
# End of 10.2 tests
#
diff --git a/mysql-test/r/range_mrr_icp.result b/mysql-test/r/range_mrr_icp.result
index d614a33..5561326 100644
--- a/mysql-test/r/range_mrr_icp.result
+++ b/mysql-test/r/range_mrr_icp.result
@@ -3099,6 +3099,78 @@ set max_session_mem_used=@tmp_24117;
deallocate prepare s;
drop table t0,t1,t2;
#
+# MDEV-23811: Both disjunct of WHERE condition contain range conditions
+# for the same index such that the second range condition
+# fully covers the first one. Additionally one of the disjuncts
+# contains a range condition for the other index.
+#
+create table t1 (
+pk int primary key auto_increment, a int, b int,
+index idx1(a), index idx2(b)
+);
+insert into t1(a,b) values
+(5,50), (1,10), (3,30), (7,70), (8,80), (4,40), (2,20), (6,60);
+insert into t1(a,b) select a+10, b+100 from t1;
+insert into t1(a,b) select a+20, b+200 from t1;
+insert into t1(a,b) select a+30, b+300 from t1;
+insert into t1(a,b) select a,b from t1;
+analyze table t1;
+Table Op Msg_type Msg_text
+test.t1 analyze status OK
+explain select * from t1 where ((a between 3 and 4) and b < 100) or (a between 2 and 5);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where; Rowid-ordered scan
+select * from t1 where ((a between 3 and 4) and b < 100) or (a between 2 and 5);
+pk a b
+1 5 50
+3 3 30
+6 4 40
+7 2 20
+65 5 50
+67 3 30
+70 4 40
+71 2 20
+explain select * from t1 where (a between 2 and 5) or ((a between 3 and 4) and b < 100);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where; Rowid-ordered scan
+select * from t1 where (a between 2 and 5) or ((a between 3 and 4) and b < 100);
+pk a b
+1 5 50
+3 3 30
+6 4 40
+7 2 20
+65 5 50
+67 3 30
+70 4 40
+71 2 20
+explain select * from t1 where (a between 3 and 4) or ((a between 2 and 5) and b < 100);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where; Rowid-ordered scan
+select * from t1 where (a between 3 and 4) or ((a between 2 and 5) and b < 100);
+pk a b
+1 5 50
+3 3 30
+6 4 40
+7 2 20
+65 5 50
+67 3 30
+70 4 40
+71 2 20
+explain select * from t1 where ((a between 2 and 5) and b < 100) or (a between 3 and 4);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 range idx1,idx2 idx1 5 NULL 11 Using index condition; Using where; Rowid-ordered scan
+select * from t1 where ((a between 2 and 5) and b < 100) or (a between 3 and 4);
+pk a b
+1 5 50
+3 3 30
+6 4 40
+7 2 20
+65 5 50
+67 3 30
+70 4 40
+71 2 20
+drop table t1;
+#
# End of 10.2 tests
#
set optimizer_switch=@mrr_icp_extra_tmp;
diff --git a/mysql-test/r/range_vs_index_merge_innodb.result b/mysql-test/r/range_vs_index_merge_innodb.result
index 581f512..916c30b 100644
--- a/mysql-test/r/range_vs_index_merge_innodb.result
+++ b/mysql-test/r/range_vs_index_merge_innodb.result
@@ -369,7 +369,7 @@ WHERE ((ID < 200) AND (Name LIKE 'Ha%' OR (Country > 'A' AND Country < 'ARG')))
OR ((ID BETWEEN 100 AND 200) AND
(Name LIKE 'Pa%' OR (Population > 103000 AND Population < 104000)));
id select_type table type possible_keys key key_len ref rows Extra
-1 SIMPLE City index_merge PRIMARY,Population,Country,Name Name,Population,PRIMARY 39,4,4 NULL 307 Using sort_union(Name,Population,PRIMARY); Using where
+1 SIMPLE City range PRIMARY,Population,Country,Name PRIMARY 4 NULL 200 Using where
SELECT * FROM City USE INDEX ()
WHERE ((ID < 10) AND (Name LIKE 'H%' OR (Country > 'A' AND Country < 'ARG')))
OR ((ID BETWEEN 100 AND 110) AND
diff --git a/mysql-test/t/range.test b/mysql-test/t/range.test
index f34ac20..264f7c7 100644
--- a/mysql-test/t/range.test
+++ b/mysql-test/t/range.test
@@ -2142,6 +2142,48 @@ deallocate prepare s;
drop table t0,t1,t2;
--echo #
+--echo # MDEV-23811: Both disjunct of WHERE condition contain range conditions
+--echo # for the same index such that the second range condition
+--echo # fully covers the first one. Additionally one of the disjuncts
+--echo # contains a range condition for the other index.
+--echo #
+
+create table t1 (
+ pk int primary key auto_increment, a int, b int,
+ index idx1(a), index idx2(b)
+);
+insert into t1(a,b) values
+ (5,50), (1,10), (3,30), (7,70), (8,80), (4,40), (2,20), (6,60);
+insert into t1(a,b) select a+10, b+100 from t1;
+insert into t1(a,b) select a+20, b+200 from t1;
+insert into t1(a,b) select a+30, b+300 from t1;
+insert into t1(a,b) select a,b from t1;
+
+analyze table t1;
+
+let $q1=
+select * from t1 where ((a between 3 and 4) and b < 100) or (a between 2 and 5);
+eval explain $q1;
+eval $q1;
+
+let $q2=
+select * from t1 where (a between 2 and 5) or ((a between 3 and 4) and b < 100);
+eval explain $q2;
+eval $q2;
+
+let $q3=
+select * from t1 where (a between 3 and 4) or ((a between 2 and 5) and b < 100);
+eval explain $q3;
+eval $q3;
+
+let $q4=
+select * from t1 where ((a between 2 and 5) and b < 100) or (a between 3 and 4);
+eval explain $q4;
+eval $q4;
+
+drop table t1;
+
+--echo #
--echo # End of 10.2 tests
--echo #
diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index e933d2a..798b1f2 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -1852,6 +1852,9 @@ SEL_ARG::SEL_ARG(SEL_ARG &arg) :Sql_alloc()
next_key_part=arg.next_key_part;
max_part_no= arg.max_part_no;
use_count=1; elements=1;
+ next= 0;
+ if (next_key_part)
+ ++next_key_part->use_count;
}
@@ -9597,10 +9600,11 @@ key_or(RANGE_OPT_PARAM *param, SEL_ARG *key1,SEL_ARG *key2)
if (!tmp->next_key_part)
{
- if (key2->use_count)
+ SEL_ARG *key2_next= key2->next;
+ if (key2_shared)
{
SEL_ARG *key2_cpy= new SEL_ARG(*key2);
- if (key2_cpy)
+ if (!key2_cpy)
return 0;
key2= key2_cpy;
}
@@ -9621,7 +9625,7 @@ key_or(RANGE_OPT_PARAM *param, SEL_ARG *key1,SEL_ARG *key2)
Move on to next range in key2
*/
key2->increment_use_count(-1); // Free not used tree
- key2=key2->next;
+ key2=key2_next;
continue;
}
else
1
0
[Commits] 3589481d70e: MDEV-9750: Quick memory exhaustion with 'extended_keys=on' ...
by Sergei Petrunia 09 Nov '20
by Sergei Petrunia 09 Nov '20
09 Nov '20
revision-id: 3589481d70e78b03b1a4c15fbfd8891d29e6eb66 (mariadb-10.4.11-420-g3589481d70e)
parent(s): c2ac0ce1f02e3ae2b1de5c07ba40bed25c30dc40
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2020-11-09 23:40:59 +0300
message:
MDEV-9750: Quick memory exhaustion with 'extended_keys=on' ...
(Variant #2)
Do not produce SEL_ARG graphs that would yield huge numbers of ranges.
Introduce a concept of SEL_ARG graph's "weight". If we are about to
produce a graph whose "weight" exceeds the limit, remove the parts
of SEL_ARG graph that represent the biggest key parts. Do so until
the graph's is within the limit.
Variant #2: Don't call enforce_sel_arg_weight_limit() for sub-graphs,
as this has complicated semantics if the subgraph has shared
sub-sub-graphs. Instead, do pruning it only after we've constructed
the entire SEL_ARG graph.
---
mysql-test/main/range.result | 46 +++++++++
mysql-test/main/range.test | 34 +++++++
mysql-test/main/range_mrr_icp.result | 46 +++++++++
sql/opt_range.cc | 182 +++++++++++++++++++++++++++++++++--
sql/opt_range.h | 12 ++-
5 files changed, 313 insertions(+), 7 deletions(-)
diff --git a/mysql-test/main/range.result b/mysql-test/main/range.result
index b708628b625..9800d931dd6 100644
--- a/mysql-test/main/range.result
+++ b/mysql-test/main/range.result
@@ -3135,6 +3135,52 @@ drop table t1,ten,t2;
#
# End of 10.2 tests
#
+#
+# MDEV-9750: Quick memory exhaustion with 'extended_keys=on'...
+#
+create table t1 (
+kp1 int,
+kp2 int,
+kp3 int,
+kp4 int,
+key key1(kp1, kp2, kp3,kp4)
+);
+insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3);
+set @tmp_9750=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t1 where
+kp1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp2 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp3 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp4 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
+;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index key1 key1 20 NULL 3 Using where; Using index
+set @json= (select json_detailed(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
+from information_schema.optimizer_trace);
+# This will show 3-component ranges.
+# The ranges were produced, but the optimizer has cut away kp4
+# to keep the number of ranges at manageable level:
+select left(@json, 500);
+left(@json, 500)
+[
+
+ [
+
+ {
+ "index": "key1",
+ "ranges":
+ [
+ "(1,1,1) <= (kp1,kp2,kp3) <= (1,1,1)",
+ "(1,1,2) <= (kp1,kp2,kp3) <= (1,1,2)",
+ "(1,1,3) <= (kp1,kp2,kp3) <= (1,1,3)",
+ "(1,1,4) <= (kp1,kp2,kp3) <= (1,1,4)",
+ "(1,1,5) <= (kp1,kp2,kp3) <= (1,1,5)",
+ "(1,1,6) <= (kp1,kp2,kp3) <= (1,1,6)",
+ "(1,1,7) <= (kp1,kp2,kp3) <= (1,1,7)",
+ "
+set optimizer_trace=@tmp_9750;
+drop table t1;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/mysql-test/main/range.test b/mysql-test/main/range.test
index b5980a8f616..642ae3f8a08 100644
--- a/mysql-test/main/range.test
+++ b/mysql-test/main/range.test
@@ -2119,6 +2119,40 @@ drop table t1,ten,t2;
--echo # End of 10.2 tests
--echo #
+--echo #
+--echo # MDEV-9750: Quick memory exhaustion with 'extended_keys=on'...
+--echo #
+
+create table t1 (
+ kp1 int,
+ kp2 int,
+ kp3 int,
+ kp4 int,
+ key key1(kp1, kp2, kp3,kp4)
+);
+
+insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3);
+
+# 20 * 20 * 20 *20 = 400*400 = 160,000 ranges
+set @tmp_9750=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t1 where
+ kp1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+ kp2 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+ kp3 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+ kp4 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
+;
+
+set @json= (select json_detailed(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
+ from information_schema.optimizer_trace);
+--echo # This will show 3-component ranges.
+--echo # The ranges were produced, but the optimizer has cut away kp4
+--echo # to keep the number of ranges at manageable level:
+select left(@json, 500);
+
+set optimizer_trace=@tmp_9750;
+drop table t1;
+
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/mysql-test/main/range_mrr_icp.result b/mysql-test/main/range_mrr_icp.result
index 04c3ad2780d..128f23d71f6 100644
--- a/mysql-test/main/range_mrr_icp.result
+++ b/mysql-test/main/range_mrr_icp.result
@@ -3132,6 +3132,52 @@ drop table t1,ten,t2;
#
# End of 10.2 tests
#
+#
+# MDEV-9750: Quick memory exhaustion with 'extended_keys=on'...
+#
+create table t1 (
+kp1 int,
+kp2 int,
+kp3 int,
+kp4 int,
+key key1(kp1, kp2, kp3,kp4)
+);
+insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3);
+set @tmp_9750=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t1 where
+kp1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp2 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp3 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp4 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
+;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index key1 key1 20 NULL 3 Using where; Using index
+set @json= (select json_detailed(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
+from information_schema.optimizer_trace);
+# This will show 3-component ranges.
+# The ranges were produced, but the optimizer has cut away kp4
+# to keep the number of ranges at manageable level:
+select left(@json, 500);
+left(@json, 500)
+[
+
+ [
+
+ {
+ "index": "key1",
+ "ranges":
+ [
+ "(1,1,1) <= (kp1,kp2,kp3) <= (1,1,1)",
+ "(1,1,2) <= (kp1,kp2,kp3) <= (1,1,2)",
+ "(1,1,3) <= (kp1,kp2,kp3) <= (1,1,3)",
+ "(1,1,4) <= (kp1,kp2,kp3) <= (1,1,4)",
+ "(1,1,5) <= (kp1,kp2,kp3) <= (1,1,5)",
+ "(1,1,6) <= (kp1,kp2,kp3) <= (1,1,6)",
+ "(1,1,7) <= (kp1,kp2,kp3) <= (1,1,7)",
+ "
+set optimizer_trace=@tmp_9750;
+drop table t1;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index eed7baab377..cfa77a058ac 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -399,6 +399,11 @@ static SEL_ARG *key_or(RANGE_OPT_PARAM *param,
static SEL_ARG *key_and(RANGE_OPT_PARAM *param,
SEL_ARG *key1, SEL_ARG *key2,
uint clone_flag);
+static SEL_ARG *key_or_with_limit(RANGE_OPT_PARAM *param,
+ SEL_ARG *key1, SEL_ARG *key2);
+static SEL_ARG *key_and_with_limit(RANGE_OPT_PARAM *param,
+ SEL_ARG *key1, SEL_ARG *key2,
+ uint clone_flag);
static bool get_range(SEL_ARG **e1,SEL_ARG **e2,SEL_ARG *root1);
bool get_quick_keys(PARAM *param,QUICK_RANGE_SELECT *quick,KEY_PART *key,
SEL_ARG *key_tree, uchar *min_key,uint min_key_flag,
@@ -410,6 +415,8 @@ static bool null_part_in_key(KEY_PART *key_part, const uchar *key,
uint length);
static bool is_key_scan_ror(PARAM *param, uint keynr, uint8 nparts);
+static SEL_ARG *enforce_sel_arg_weight_limit(SEL_ARG *sel_arg);
+
#include "opt_range_mrr.cc"
static bool sel_trees_have_common_keys(SEL_TREE *tree1, SEL_TREE *tree2,
@@ -706,7 +713,7 @@ int SEL_IMERGE::or_sel_tree_with_checks(RANGE_OPT_PARAM *param,
SEL_ARG *key1= (*or_tree)->keys[key_no];
SEL_ARG *key2= tree->keys[key_no];
key2->incr_refs();
- if ((result->keys[key_no]= key_or(param, key1, key2)))
+ if ((result->keys[key_no]= key_or_with_limit(param, key1, key2)))
{
result_keys.set_bit(key_no);
@@ -1877,6 +1884,7 @@ SEL_ARG::SEL_ARG(SEL_ARG &arg) :Sql_alloc()
next_key_part=arg.next_key_part;
max_part_no= arg.max_part_no;
use_count=1; elements=1;
+ weight=1;
}
@@ -1893,7 +1901,7 @@ SEL_ARG::SEL_ARG(Field *f,const uchar *min_value_arg,
:min_flag(0), max_flag(0), maybe_flag(0), maybe_null(f->real_maybe_null()),
elements(1), use_count(1), field(f), min_value((uchar*) min_value_arg),
max_value((uchar*) max_value_arg), next(0),prev(0),
- next_key_part(0), color(BLACK), type(KEY_RANGE)
+ next_key_part(0), color(BLACK), type(KEY_RANGE), weight(1)
{
left=right= &null_element;
max_part_no= 1;
@@ -1905,7 +1913,7 @@ SEL_ARG::SEL_ARG(Field *field_,uint8 part_,
:min_flag(min_flag_),max_flag(max_flag_),maybe_flag(maybe_flag_),
part(part_),maybe_null(field_->real_maybe_null()), elements(1),use_count(1),
field(field_), min_value(min_value_), max_value(max_value_),
- next(0),prev(0),next_key_part(0),color(BLACK),type(KEY_RANGE)
+ next(0),prev(0),next_key_part(0),color(BLACK),type(KEY_RANGE), weight(1)
{
max_part_no= part+1;
left=right= &null_element;
@@ -5432,7 +5440,7 @@ TABLE_READ_PLAN *merge_same_index_scans(PARAM *param, SEL_IMERGE *imerge,
if ((*tree)->keys[key_idx])
(*tree)->keys[key_idx]->incr_refs();
if (((*changed_tree)->keys[key_idx]=
- key_or(param, key, (*tree)->keys[key_idx])))
+ key_or_with_limit(param, key, (*tree)->keys[key_idx])))
(*changed_tree)->keys_map.set_bit(key_idx);
*tree= NULL;
removed_cnt++;
@@ -9094,7 +9102,7 @@ int and_range_trees(RANGE_OPT_PARAM *param, SEL_TREE *tree1, SEL_TREE *tree2,
key2->incr_refs();
}
SEL_ARG *key;
- if ((result->keys[key_no]= key =key_and(param, key1, key2, flag)))
+ if ((result->keys[key_no]= key =key_and_with_limit(param, key1, key2, flag)))
{
if (key && key->type == SEL_ARG::IMPOSSIBLE)
{
@@ -9637,7 +9645,7 @@ tree_or(RANGE_OPT_PARAM *param,SEL_TREE *tree1,SEL_TREE *tree2)
key1->incr_refs();
key2->incr_refs();
}
- if ((result->keys[key_no]= key_or(param, key1, key2)))
+ if ((result->keys[key_no]= key_or_with_limit(param, key1, key2)))
result->keys_map.set_bit(key_no);
}
result->type= tree1->type;
@@ -9723,6 +9731,8 @@ and_all_keys(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2,
key1->right= key1->left= &null_element;
key1->next= key1->prev= 0;
}
+ uint new_weight= 0;
+
for (next=key1->first(); next ; next=next->next)
{
if (next->next_key_part)
@@ -9734,18 +9744,23 @@ and_all_keys(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2,
continue;
}
next->next_key_part=tmp;
+ new_weight += 1 + tmp->weight;
if (use_count)
next->increment_use_count(use_count);
if (param->alloced_sel_args > SEL_ARG::MAX_SEL_ARGS)
break;
}
else
+ {
+ new_weight += 1 + key2->weight;
next->next_key_part=key2;
+ }
}
if (!key1)
return &null_element; // Impossible ranges
key1->use_count++;
key1->max_part_no= MY_MAX(key2->max_part_no, key2->part+1);
+ key1->weight= new_weight;
return key1;
}
@@ -9780,6 +9795,17 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
clone_flag=swap_clone_flag(clone_flag);
}
// key1->part < key2->part
+
+ /*
+ Do not combine the trees if their total weight is likely to exceed the
+ MAX_WEIGHT.
+ (It is possible that key1 has next_key_part that has empty overlap with
+ key2. In this case, the combined tree will have a smaller weight than we
+ predict. We assume this is rare.)
+ */
+ if (key1->weight + key1->elements*key2->weight > SEL_ARG::MAX_WEIGHT)
+ return key1;
+
key1->use_count--;
if (key1->use_count > 0)
if (!(key1= key1->clone_tree(param)))
@@ -9810,6 +9836,9 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
{ // Both are maybe key
key1->next_key_part=key_and(param, key1->next_key_part,
key2->next_key_part, clone_flag);
+
+ key1->weight = 1 + (key1->next_key_part? key1->next_key_part->weight : 0);
+
if (key1->next_key_part &&
key1->next_key_part->type == SEL_ARG::IMPOSSIBLE)
return key1;
@@ -9839,6 +9868,7 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
key2->use_count--;
SEL_ARG *e1=key1->first(), *e2=key2->first(), *new_tree=0;
uint max_part_no= MY_MAX(key1->max_part_no, key2->max_part_no);
+ uint new_weight= 0; // Weight of the result tree
while (e1 && e2)
{
@@ -9860,6 +9890,7 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
if (!new_arg)
return &null_element; // End of memory
new_arg->next_key_part=next;
+ new_weight += 1 + (next? next->weight: 0);
if (!new_tree)
{
new_tree=new_arg;
@@ -9877,6 +9908,7 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
if (!new_tree)
return &null_element; // Impossible range
new_tree->max_part_no= max_part_no;
+ new_tree->weight= new_weight;
return new_tree;
}
@@ -9899,6 +9931,21 @@ get_range(SEL_ARG **e1,SEL_ARG **e2,SEL_ARG *root1)
}
+static SEL_ARG *key_or_with_limit(RANGE_OPT_PARAM *param,
+ SEL_ARG *key1, SEL_ARG *key2)
+{
+ return enforce_sel_arg_weight_limit(key_or(param, key1, key2));
+}
+
+
+static SEL_ARG *key_and_with_limit(RANGE_OPT_PARAM *param,
+ SEL_ARG *key1, SEL_ARG *key2,
+ uint clone_flag)
+{
+ return enforce_sel_arg_weight_limit(key_and(param, key1, key2, clone_flag));
+}
+
+
/**
Combine two range expression under a common OR. On a logical level, the
transformation is key_or( expr1, expr2 ) => expr1 OR expr2.
@@ -10553,6 +10600,19 @@ key_or(RANGE_OPT_PARAM *param, SEL_ARG *key1,SEL_ARG *key2)
}
key1->use_count++;
+ /* Re-compute the result tree's weight. */
+ {
+ uint new_weight= 0;
+ const SEL_ARG *sl;
+ for (sl= key1->first(); sl ; sl= sl->next)
+ {
+ new_weight++;
+ if (sl->next_key_part)
+ new_weight += sl->next_key_part->weight;
+ }
+ key1->weight= new_weight;
+ }
+
key1->max_part_no= max_part_no;
return key1;
}
@@ -10590,6 +10650,108 @@ static bool eq_tree(SEL_ARG* a,SEL_ARG *b)
}
+/*
+ Compute the MAX(key part) in this SEL_ARG graph.
+*/
+uint SEL_ARG::get_max_key_part() const
+{
+ const SEL_ARG *cur;
+ uint max_part= part;
+ for (cur= first(); cur ; cur=cur->next)
+ {
+ if (cur->next_key_part)
+ {
+ uint mp= cur->next_key_part->get_max_key_part();
+ max_part = MY_MAX(part, mp);
+ }
+ }
+ return max_part;
+}
+
+
+/*
+ Remove the SEL_ARG graph elements which have part > max_part.
+
+ @detail
+ Also update weight for the graph and any modified subgraphs.
+*/
+
+void prune_sel_arg_graph(SEL_ARG *sel_arg, uint max_part)
+{
+ SEL_ARG *cur;
+ DBUG_ASSERT(max_part >= sel_arg->part);
+
+ for (cur= sel_arg->first(); cur ; cur=cur->next)
+ {
+ if (cur->next_key_part)
+ {
+ if (cur->next_key_part->part > max_part)
+ {
+ // Remove cur->next_key_part.
+ sel_arg->weight -= cur->next_key_part->weight;
+ cur->next_key_part= NULL;
+ }
+ else
+ {
+ uint old_weight = cur->next_key_part->weight;
+ prune_sel_arg_graph(cur->next_key_part, max_part);
+ old_weight -= cur->next_key_part->weight;
+ sel_arg->weight -= old_weight;
+ }
+ }
+ }
+}
+
+
+/*
+ @brief
+ Make sure the passed SEL_ARG graph's weight is below SEL_ARG::MAX_WEIGHT,
+ by cutting off branches if necessary.
+
+ @detail
+ @see declaration of SEL_ARG::weight for definition of weight.
+
+ This function attempts to reduce the graph's weight by cutting off
+ SEL_ARG::next_key_part connections if necessary.
+
+ We start with maximum used keypart and then remove one keypart after
+ another until the graph's weight is within the limit.
+
+ @return
+ tree pointer The tree after processing,
+ NULL If it was not possible to reduce the weight of the tree below the
+ limit.
+*/
+
+SEL_ARG *enforce_sel_arg_weight_limit(SEL_ARG *sel_arg)
+{
+ if (!sel_arg || sel_arg->type != SEL_ARG::KEY_RANGE)
+ return sel_arg;
+
+ while (1)
+ {
+ if (sel_arg->weight <= SEL_ARG::MAX_WEIGHT)
+ return sel_arg;
+
+ uint max_part= sel_arg->get_max_key_part();
+ if (max_part == sel_arg->part)
+ return NULL;
+
+#ifdef EXTRA_DEBUG
+ uint weight1= sel_arg->weight;
+#endif
+
+ max_part--;
+ prune_sel_arg_graph(sel_arg, max_part);
+
+#ifdef EXTRA_DEBUG
+ DBUG_PRINT("info", ("enforce_sel_arg_weight_limit: %d->%d", weight1,
+ sel_arg->weight));
+#endif
+ }
+}
+
+
SEL_ARG *
SEL_ARG::insert(SEL_ARG *key)
{
@@ -10628,6 +10790,8 @@ SEL_ARG::insert(SEL_ARG *key)
SEL_ARG *root=rb_insert(key); // rebalance tree
root->use_count=this->use_count; // copy root info
root->elements= this->elements+1;
+ // Add the weight: weight of this element (=1) + next_key_part's weight
+ root->weight += 1 + (next_key_part? next_key_part->weight: 0);
root->maybe_flag=this->maybe_flag;
return root;
}
@@ -10685,6 +10849,11 @@ SEL_ARG::tree_delete(SEL_ARG *key)
root=this;
this->parent= 0;
+ // Compute the weight the tree will have after the element is removed
+ // We remove the element itself (weight=1)
+ // and the sub-graph connected to its next_key_part.
+ uint new_weight= root->weight - (1 + (key->next_key_part?
+ key->next_key_part->weight : 0));
/* Unlink from list */
if (key->prev)
key->prev->next=key->next;
@@ -10736,6 +10905,7 @@ SEL_ARG::tree_delete(SEL_ARG *key)
test_rb_tree(root,root->parent);
root->use_count=this->use_count; // Fix root counters
+ root->weight = new_weight;
root->elements=this->elements-1;
root->maybe_flag=this->maybe_flag;
DBUG_RETURN(root);
diff --git a/sql/opt_range.h b/sql/opt_range.h
index 11d9f80865a..613e8efa4f3 100644
--- a/sql/opt_range.h
+++ b/sql/opt_range.h
@@ -236,6 +236,9 @@ class SEL_ARG :public Sql_alloc
/*
The ordinal number the least significant component encountered in
the ranges of the SEL_ARG tree (the first component has number 1)
+
+ Note: this number is currently not precise, it is an upper bound.
+ @seealso SEL_ARG::get_max_key_part()
*/
uint16 max_part_no;
/*
@@ -263,6 +266,10 @@ class SEL_ARG :public Sql_alloc
enum leaf_color { BLACK,RED } color;
enum Type { IMPOSSIBLE, MAYBE, MAYBE_KEY, KEY_RANGE } type;
+ uint weight;
+ enum { MAX_WEIGHT = 32000 };
+
+ /* See RANGE_OPT_PARAM::alloced_sel_args */
enum { MAX_SEL_ARGS = 16000 };
SEL_ARG() {}
@@ -273,7 +280,7 @@ class SEL_ARG :public Sql_alloc
SEL_ARG(enum Type type_arg)
:min_flag(0), max_part_no(0) /* first key part means 1. 0 mean 'no parts'*/,
elements(1),use_count(1),left(0),right(0),
- next_key_part(0), color(BLACK), type(type_arg)
+ next_key_part(0), color(BLACK), type(type_arg), weight(1)
{}
/**
returns true if a range predicate is equal. Use all_same()
@@ -287,6 +294,9 @@ class SEL_ARG :public Sql_alloc
return true;
return cmp_min_to_min(arg) == 0 && cmp_max_to_max(arg) == 0;
}
+
+ uint get_max_key_part() const;
+
/**
returns true if all the predicates in the keypart tree are equal
*/
1
0
[Commits] f6640f37ed7: MDEV-21958: Query having many NOT-IN clauses running forever
by Sergei Petrunia 05 Nov '20
by Sergei Petrunia 05 Nov '20
05 Nov '20
revision-id: f6640f37ed701160b0e51f20f5d75d306bbe3f27 (mariadb-10.4.11-421-gf6640f37ed7)
parent(s): 7cdd4fe6440879e9309d036362414d483c642122
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2020-11-05 23:46:42 +0300
message:
MDEV-21958: Query having many NOT-IN clauses running forever
Basic variant of the fix: do not consider conditions in form
unique_key NOT IN (c1,c2...)
to be sargable. If there are only a few constants, the condition
is not selective. If there are a lot constants, the overhead of
processing such a huge range list is not worth it.
---
mysql-test/main/range.result | 30 ++++++++++++++++++++++++++++++
mysql-test/main/range.test | 24 ++++++++++++++++++++++++
mysql-test/main/range_mrr_icp.result | 30 ++++++++++++++++++++++++++++++
sql/opt_range.cc | 24 ++++++++++++++++++++++++
4 files changed, 108 insertions(+)
diff --git a/mysql-test/main/range.result b/mysql-test/main/range.result
index 9800d931dd6..b429a4146ad 100644
--- a/mysql-test/main/range.result
+++ b/mysql-test/main/range.result
@@ -3181,6 +3181,36 @@ left(@json, 500)
"
set optimizer_trace=@tmp_9750;
drop table t1;
+#
+# MDEV-21958: Query having many NOT-IN clauses running forever
+#
+create table t2 (
+pk int primary key,
+key1 int,
+col1 int,
+key (key1, pk)
+);
+insert into t2 (pk, key1) values (1,1),(2,2),(3,3),(4,4),(5,5);
+set @tmp_21958=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t2 where key1 in (1,2,3) and pk not in (1,2,3);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL PRIMARY,key1 NULL NULL NULL 5 Using where
+# This should show only ranges in form "(1) <= (key1) <= (1)"
+# ranges over "pk" should not be constructed.
+select json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
+from information_schema.optimizer_trace;
+json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
+[
+
+ [
+ "(1) <= (key1) <= (1)",
+ "(2) <= (key1) <= (2)",
+ "(3) <= (key1) <= (3)"
+ ]
+]
+set optimizer_trace=@tmp_21958;
+drop table t2;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/mysql-test/main/range.test b/mysql-test/main/range.test
index 642ae3f8a08..cd48d9d7935 100644
--- a/mysql-test/main/range.test
+++ b/mysql-test/main/range.test
@@ -2153,6 +2153,30 @@ select left(@json, 500);
set optimizer_trace=@tmp_9750;
drop table t1;
+--echo #
+--echo # MDEV-21958: Query having many NOT-IN clauses running forever
+--echo #
+create table t2 (
+ pk int primary key,
+ key1 int,
+ col1 int,
+ key (key1, pk)
+);
+
+insert into t2 (pk, key1) values (1,1),(2,2),(3,3),(4,4),(5,5);
+
+set @tmp_21958=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t2 where key1 in (1,2,3) and pk not in (1,2,3);
+
+--echo # This should show only ranges in form "(1) <= (key1) <= (1)"
+--echo # ranges over "pk" should not be constructed.
+select json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
+from information_schema.optimizer_trace;
+set optimizer_trace=@tmp_21958;
+
+drop table t2;
+
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/mysql-test/main/range_mrr_icp.result b/mysql-test/main/range_mrr_icp.result
index 128f23d71f6..1c5ab1443da 100644
--- a/mysql-test/main/range_mrr_icp.result
+++ b/mysql-test/main/range_mrr_icp.result
@@ -3178,6 +3178,36 @@ left(@json, 500)
"
set optimizer_trace=@tmp_9750;
drop table t1;
+#
+# MDEV-21958: Query having many NOT-IN clauses running forever
+#
+create table t2 (
+pk int primary key,
+key1 int,
+col1 int,
+key (key1, pk)
+);
+insert into t2 (pk, key1) values (1,1),(2,2),(3,3),(4,4),(5,5);
+set @tmp_21958=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t2 where key1 in (1,2,3) and pk not in (1,2,3);
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t2 ALL PRIMARY,key1 NULL NULL NULL 5 Using where
+# This should show only ranges in form "(1) <= (key1) <= (1)"
+# ranges over "pk" should not be constructed.
+select json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
+from information_schema.optimizer_trace;
+json_detailed(JSON_EXTRACT(trace, '$**.ranges'))
+[
+
+ [
+ "(1) <= (key1) <= (1)",
+ "(2) <= (key1) <= (2)",
+ "(3) <= (key1) <= (3)"
+ ]
+]
+set optimizer_trace=@tmp_21958;
+drop table t2;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index 7af555dbd17..3dcdb225b77 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -7787,6 +7787,30 @@ SEL_TREE *Item_func_in::get_func_mm_tree(RANGE_OPT_PARAM *param,
if (array->count > NOT_IN_IGNORE_THRESHOLD || !value_item)
DBUG_RETURN(0);
+ /*
+ If this is "unique_key NOT IN (...)", do not consider it sargable (for
+ any index, not just the unique one). The logic is as follows:
+ - if there are only a few constants, this condition is not selective
+ (unless the table is also very small in which case we won't gain
+ anything)
+ - If there are a lot of constants, the overhead of building and
+ processing enormous range list is not worth it.
+ */
+ if (param->using_real_indexes)
+ {
+ key_map::Iterator it(field->key_start);
+ uint key_no;
+ while ((key_no= it.next_bit()) != key_map::Iterator::BITMAP_END)
+ {
+ KEY *key_info= ¶m->table->key_info[key_no];
+ if (key_info->user_defined_key_parts == 1 &&
+ (key_info->flags & HA_NOSAME))
+ {
+ DBUG_RETURN(0);
+ }
+ }
+ }
+
/* Get a SEL_TREE for "(-inf|NULL) < X < c_0" interval. */
uint i=0;
do
1
0
[Commits] 7cdd4fe6440: MDEV-9750: Quick memory exhaustion with 'extended_keys=on' ...
by Sergei Petrunia 05 Nov '20
by Sergei Petrunia 05 Nov '20
05 Nov '20
revision-id: 7cdd4fe6440879e9309d036362414d483c642122 (mariadb-10.4.11-420-g7cdd4fe6440)
parent(s): c2ac0ce1f02e3ae2b1de5c07ba40bed25c30dc40
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2020-11-05 19:41:58 +0300
message:
MDEV-9750: Quick memory exhaustion with 'extended_keys=on' ...
Do not produce SEL_ARG graphs that would yield huge numbers of ranges.
Introduce a concept of SEL_ARG graph's "weight". If we are about to
produce a graph whose "weight" exceeds the limit, remove the parts
of SEL_ARG graph that represent the biggest key parts. Do so until
the graph's is within the limit.
---
mysql-test/main/range.result | 46 +++++++++++
mysql-test/main/range.test | 34 ++++++++
mysql-test/main/range_mrr_icp.result | 46 +++++++++++
sql/opt_range.cc | 147 ++++++++++++++++++++++++++++++++++-
sql/opt_range.h | 12 ++-
5 files changed, 282 insertions(+), 3 deletions(-)
diff --git a/mysql-test/main/range.result b/mysql-test/main/range.result
index b708628b625..9800d931dd6 100644
--- a/mysql-test/main/range.result
+++ b/mysql-test/main/range.result
@@ -3135,6 +3135,52 @@ drop table t1,ten,t2;
#
# End of 10.2 tests
#
+#
+# MDEV-9750: Quick memory exhaustion with 'extended_keys=on'...
+#
+create table t1 (
+kp1 int,
+kp2 int,
+kp3 int,
+kp4 int,
+key key1(kp1, kp2, kp3,kp4)
+);
+insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3);
+set @tmp_9750=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t1 where
+kp1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp2 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp3 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp4 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
+;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index key1 key1 20 NULL 3 Using where; Using index
+set @json= (select json_detailed(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
+from information_schema.optimizer_trace);
+# This will show 3-component ranges.
+# The ranges were produced, but the optimizer has cut away kp4
+# to keep the number of ranges at manageable level:
+select left(@json, 500);
+left(@json, 500)
+[
+
+ [
+
+ {
+ "index": "key1",
+ "ranges":
+ [
+ "(1,1,1) <= (kp1,kp2,kp3) <= (1,1,1)",
+ "(1,1,2) <= (kp1,kp2,kp3) <= (1,1,2)",
+ "(1,1,3) <= (kp1,kp2,kp3) <= (1,1,3)",
+ "(1,1,4) <= (kp1,kp2,kp3) <= (1,1,4)",
+ "(1,1,5) <= (kp1,kp2,kp3) <= (1,1,5)",
+ "(1,1,6) <= (kp1,kp2,kp3) <= (1,1,6)",
+ "(1,1,7) <= (kp1,kp2,kp3) <= (1,1,7)",
+ "
+set optimizer_trace=@tmp_9750;
+drop table t1;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/mysql-test/main/range.test b/mysql-test/main/range.test
index b5980a8f616..642ae3f8a08 100644
--- a/mysql-test/main/range.test
+++ b/mysql-test/main/range.test
@@ -2119,6 +2119,40 @@ drop table t1,ten,t2;
--echo # End of 10.2 tests
--echo #
+--echo #
+--echo # MDEV-9750: Quick memory exhaustion with 'extended_keys=on'...
+--echo #
+
+create table t1 (
+ kp1 int,
+ kp2 int,
+ kp3 int,
+ kp4 int,
+ key key1(kp1, kp2, kp3,kp4)
+);
+
+insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3);
+
+# 20 * 20 * 20 *20 = 400*400 = 160,000 ranges
+set @tmp_9750=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t1 where
+ kp1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+ kp2 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+ kp3 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+ kp4 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
+;
+
+set @json= (select json_detailed(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
+ from information_schema.optimizer_trace);
+--echo # This will show 3-component ranges.
+--echo # The ranges were produced, but the optimizer has cut away kp4
+--echo # to keep the number of ranges at manageable level:
+select left(@json, 500);
+
+set optimizer_trace=@tmp_9750;
+drop table t1;
+
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/mysql-test/main/range_mrr_icp.result b/mysql-test/main/range_mrr_icp.result
index 04c3ad2780d..128f23d71f6 100644
--- a/mysql-test/main/range_mrr_icp.result
+++ b/mysql-test/main/range_mrr_icp.result
@@ -3132,6 +3132,52 @@ drop table t1,ten,t2;
#
# End of 10.2 tests
#
+#
+# MDEV-9750: Quick memory exhaustion with 'extended_keys=on'...
+#
+create table t1 (
+kp1 int,
+kp2 int,
+kp3 int,
+kp4 int,
+key key1(kp1, kp2, kp3,kp4)
+);
+insert into t1 values (1,1,1,1),(2,2,2,2),(3,3,3,3);
+set @tmp_9750=@@optimizer_trace;
+set optimizer_trace=1;
+explain select * from t1 where
+kp1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp2 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp3 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20) and
+kp4 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20)
+;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 index key1 key1 20 NULL 3 Using where; Using index
+set @json= (select json_detailed(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
+from information_schema.optimizer_trace);
+# This will show 3-component ranges.
+# The ranges were produced, but the optimizer has cut away kp4
+# to keep the number of ranges at manageable level:
+select left(@json, 500);
+left(@json, 500)
+[
+
+ [
+
+ {
+ "index": "key1",
+ "ranges":
+ [
+ "(1,1,1) <= (kp1,kp2,kp3) <= (1,1,1)",
+ "(1,1,2) <= (kp1,kp2,kp3) <= (1,1,2)",
+ "(1,1,3) <= (kp1,kp2,kp3) <= (1,1,3)",
+ "(1,1,4) <= (kp1,kp2,kp3) <= (1,1,4)",
+ "(1,1,5) <= (kp1,kp2,kp3) <= (1,1,5)",
+ "(1,1,6) <= (kp1,kp2,kp3) <= (1,1,6)",
+ "(1,1,7) <= (kp1,kp2,kp3) <= (1,1,7)",
+ "
+set optimizer_trace=@tmp_9750;
+drop table t1;
set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
@innodb_stats_persistent_sample_pages_save;
diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index eed7baab377..7af555dbd17 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -410,6 +410,8 @@ static bool null_part_in_key(KEY_PART *key_part, const uchar *key,
uint length);
static bool is_key_scan_ror(PARAM *param, uint keynr, uint8 nparts);
+static SEL_ARG *enforce_sel_arg_weight_limit(SEL_ARG *sel_arg);
+
#include "opt_range_mrr.cc"
static bool sel_trees_have_common_keys(SEL_TREE *tree1, SEL_TREE *tree2,
@@ -1877,6 +1879,7 @@ SEL_ARG::SEL_ARG(SEL_ARG &arg) :Sql_alloc()
next_key_part=arg.next_key_part;
max_part_no= arg.max_part_no;
use_count=1; elements=1;
+ weight=1;
}
@@ -1893,7 +1896,7 @@ SEL_ARG::SEL_ARG(Field *f,const uchar *min_value_arg,
:min_flag(0), max_flag(0), maybe_flag(0), maybe_null(f->real_maybe_null()),
elements(1), use_count(1), field(f), min_value((uchar*) min_value_arg),
max_value((uchar*) max_value_arg), next(0),prev(0),
- next_key_part(0), color(BLACK), type(KEY_RANGE)
+ next_key_part(0), color(BLACK), type(KEY_RANGE), weight(1)
{
left=right= &null_element;
max_part_no= 1;
@@ -1905,7 +1908,7 @@ SEL_ARG::SEL_ARG(Field *field_,uint8 part_,
:min_flag(min_flag_),max_flag(max_flag_),maybe_flag(maybe_flag_),
part(part_),maybe_null(field_->real_maybe_null()), elements(1),use_count(1),
field(field_), min_value(min_value_), max_value(max_value_),
- next(0),prev(0),next_key_part(0),color(BLACK),type(KEY_RANGE)
+ next(0),prev(0),next_key_part(0),color(BLACK),type(KEY_RANGE), weight(1)
{
max_part_no= part+1;
left=right= &null_element;
@@ -9723,6 +9726,8 @@ and_all_keys(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2,
key1->right= key1->left= &null_element;
key1->next= key1->prev= 0;
}
+ uint new_weight= 0;
+
for (next=key1->first(); next ; next=next->next)
{
if (next->next_key_part)
@@ -9734,18 +9739,24 @@ and_all_keys(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2,
continue;
}
next->next_key_part=tmp;
+ new_weight += 1 + tmp->weight;
if (use_count)
next->increment_use_count(use_count);
if (param->alloced_sel_args > SEL_ARG::MAX_SEL_ARGS)
break;
}
else
+ {
+ new_weight += 1 + key2->weight;
next->next_key_part=key2;
+ }
}
if (!key1)
return &null_element; // Impossible ranges
key1->use_count++;
key1->max_part_no= MY_MAX(key2->max_part_no, key2->part+1);
+ key1->weight= new_weight;
+ key1= enforce_sel_arg_weight_limit(key1);
return key1;
}
@@ -9780,6 +9791,17 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
clone_flag=swap_clone_flag(clone_flag);
}
// key1->part < key2->part
+
+ /*
+ Do not combine the trees if their total weight is likely to exceed the
+ MAX_WEIGHT.
+ (It is possible that key1 has next_key_part that has empty overlap with
+ key2. In this case, the combined tree will have a smaller weight than we
+ predict. We assume this is rare.)
+ */
+ if (key1->weight + key1->elements*key2->weight > SEL_ARG::MAX_WEIGHT)
+ return key1;
+
key1->use_count--;
if (key1->use_count > 0)
if (!(key1= key1->clone_tree(param)))
@@ -9810,6 +9832,9 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
{ // Both are maybe key
key1->next_key_part=key_and(param, key1->next_key_part,
key2->next_key_part, clone_flag);
+
+ key1->weight = 1 + (key1->next_key_part? key1->next_key_part->weight : 0);
+
if (key1->next_key_part &&
key1->next_key_part->type == SEL_ARG::IMPOSSIBLE)
return key1;
@@ -9839,6 +9864,7 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
key2->use_count--;
SEL_ARG *e1=key1->first(), *e2=key2->first(), *new_tree=0;
uint max_part_no= MY_MAX(key1->max_part_no, key2->max_part_no);
+ uint new_weight= 0; // Weight of the result tree
while (e1 && e2)
{
@@ -9860,6 +9886,7 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
if (!new_arg)
return &null_element; // End of memory
new_arg->next_key_part=next;
+ new_weight += 1 + (next? next->weight: 0);
if (!new_tree)
{
new_tree=new_arg;
@@ -9877,6 +9904,8 @@ key_and(RANGE_OPT_PARAM *param, SEL_ARG *key1, SEL_ARG *key2, uint clone_flag)
if (!new_tree)
return &null_element; // Impossible range
new_tree->max_part_no= max_part_no;
+ new_tree->weight= new_weight;
+ new_tree= enforce_sel_arg_weight_limit(new_tree);
return new_tree;
}
@@ -10553,7 +10582,21 @@ key_or(RANGE_OPT_PARAM *param, SEL_ARG *key1,SEL_ARG *key2)
}
key1->use_count++;
+ /* Re-compute the result tree's weight. */
+ {
+ uint new_weight= 0;
+ const SEL_ARG *sl;
+ for (sl= key1->first(); sl ; sl= sl->next)
+ {
+ new_weight++;
+ if (sl->next_key_part)
+ new_weight += sl->next_key_part->weight;
+ }
+ key1->weight= new_weight;
+ }
+
key1->max_part_no= max_part_no;
+ key1= enforce_sel_arg_weight_limit(key1);
return key1;
}
@@ -10590,6 +10633,98 @@ static bool eq_tree(SEL_ARG* a,SEL_ARG *b)
}
+/*
+ Compute the MAX(key part) in this SEL_ARG graph.
+*/
+uint SEL_ARG::get_max_key_part() const
+{
+ const SEL_ARG *cur;
+ uint max_part= part;
+ for (cur= first(); cur ; cur=cur->next)
+ {
+ if (cur->next_key_part)
+ {
+ uint mp= cur->next_key_part->get_max_key_part();
+ max_part = MY_MAX(part, mp);
+ }
+ }
+ return max_part;
+}
+
+
+/*
+ Remove the SEL_ARG graph elements which have part > max_part.
+
+ @detail
+ Also update weight for the graph and any modified subgraphs.
+*/
+
+void prune_sel_arg_graph(SEL_ARG *sel_arg, uint max_part)
+{
+ SEL_ARG *cur;
+ DBUG_ASSERT(max_part >= sel_arg->part);
+
+ for (cur= sel_arg->first(); cur ; cur=cur->next)
+ {
+ if (cur->next_key_part)
+ {
+ if (cur->next_key_part->part > max_part)
+ {
+ // Remove cur->next_key_part.
+ sel_arg->weight -= cur->next_key_part->weight;
+ cur->next_key_part= NULL;
+ }
+ else
+ {
+ uint old_weight = cur->next_key_part->weight;
+ prune_sel_arg_graph(cur->next_key_part, max_part);
+ old_weight -= cur->next_key_part->weight;
+ sel_arg->weight -= old_weight;
+ }
+ }
+ }
+}
+
+
+/*
+ @brief
+ Make sure the passed SEL_ARG graph's weight is below SEL_ARG::MAX_WEIGHT,
+ by cutting off branches if necessary.
+
+ @detail
+ @see declaration of SEL_ARG::weight for definition of weight.
+
+ This function attempts to reduce the graph's weight by cutting off
+ SEL_ARG::next_key_part connections if necessary.
+
+ We start with maximum used keypart and then remove one keypart after
+ another until the graph's weight is within the limit.
+
+ @return
+ tree pointer The tree after processing,
+ NULL If it was not possible to reduce the weight of the tree below the
+ limit.
+*/
+
+SEL_ARG *enforce_sel_arg_weight_limit(SEL_ARG *sel_arg)
+{
+ while (1)
+ {
+ if (sel_arg->weight <= SEL_ARG::MAX_WEIGHT)
+ return sel_arg;
+
+ uint max_part= sel_arg->get_max_key_part();
+ if (max_part == sel_arg->part)
+ return NULL;
+
+ max_part--;
+ //uint weight1= sel_arg->weight;
+ prune_sel_arg_graph(sel_arg, max_part);
+ //fprintf(stderr, "AAA: enforce_weight_limit: %d -> %d\n", weight1, sel_arg->weight);
+ }
+}
+
+
SEL_ARG *
SEL_ARG::insert(SEL_ARG *key)
{
@@ -10628,6 +10763,8 @@ SEL_ARG::insert(SEL_ARG *key)
SEL_ARG *root=rb_insert(key); // rebalance tree
root->use_count=this->use_count; // copy root info
root->elements= this->elements+1;
+ // Add the weight: weight of this element (=1) + next_key_part's weight
+ root->weight += 1 + (next_key_part? next_key_part->weight: 0);
root->maybe_flag=this->maybe_flag;
return root;
}
@@ -10685,6 +10822,11 @@ SEL_ARG::tree_delete(SEL_ARG *key)
root=this;
this->parent= 0;
+ // Compute the weight the tree will have after the element is removed
+ // We remove the element itself (weight=1)
+ // and the sub-graph connected to its next_key_part.
+ uint new_weight= root->weight - (1 + (key->next_key_part?
+ key->next_key_part->weight : 0));
/* Unlink from list */
if (key->prev)
key->prev->next=key->next;
@@ -10736,6 +10878,7 @@ SEL_ARG::tree_delete(SEL_ARG *key)
test_rb_tree(root,root->parent);
root->use_count=this->use_count; // Fix root counters
+ root->weight = new_weight;
root->elements=this->elements-1;
root->maybe_flag=this->maybe_flag;
DBUG_RETURN(root);
diff --git a/sql/opt_range.h b/sql/opt_range.h
index 11d9f80865a..613e8efa4f3 100644
--- a/sql/opt_range.h
+++ b/sql/opt_range.h
@@ -236,6 +236,9 @@ class SEL_ARG :public Sql_alloc
/*
The ordinal number the least significant component encountered in
the ranges of the SEL_ARG tree (the first component has number 1)
+
+ Note: this number is currently not precise, it is an upper bound.
+ @seealso SEL_ARG::get_max_key_part()
*/
uint16 max_part_no;
/*
@@ -263,6 +266,10 @@ class SEL_ARG :public Sql_alloc
enum leaf_color { BLACK,RED } color;
enum Type { IMPOSSIBLE, MAYBE, MAYBE_KEY, KEY_RANGE } type;
+ uint weight;
+ enum { MAX_WEIGHT = 32000 };
+
+ /* See RANGE_OPT_PARAM::alloced_sel_args */
enum { MAX_SEL_ARGS = 16000 };
SEL_ARG() {}
@@ -273,7 +280,7 @@ class SEL_ARG :public Sql_alloc
SEL_ARG(enum Type type_arg)
:min_flag(0), max_part_no(0) /* first key part means 1. 0 mean 'no parts'*/,
elements(1),use_count(1),left(0),right(0),
- next_key_part(0), color(BLACK), type(type_arg)
+ next_key_part(0), color(BLACK), type(type_arg), weight(1)
{}
/**
returns true if a range predicate is equal. Use all_same()
@@ -287,6 +294,9 @@ class SEL_ARG :public Sql_alloc
return true;
return cmp_min_to_min(arg) == 0 && cmp_max_to_max(arg) == 0;
}
+
+ uint get_max_key_part() const;
+
/**
returns true if all the predicates in the keypart tree are equal
*/
1
0
[Commits] d74880690cb: MDEV-17783: AddressSanitizer: stack-buffer-overflow in table_cond_selectivity with optimizer_use_condition_selectivity > 1, join_cache_level >2
by varun 03 Nov '20
by varun 03 Nov '20
03 Nov '20
revision-id: d74880690cb5c52593eb65c276a1d4a7f6a6105a (mariadb-10.2.31-551-gd74880690cb)
parent(s): 65e26bc1ba7b81d8477d51534d30f072f38913a1
author: Varun Gupta
committer: Varun Gupta
timestamp: 2020-11-02 20:23:00 +0530
message:
MDEV-17783: AddressSanitizer: stack-buffer-overflow in table_cond_selectivity with optimizer_use_condition_selectivity > 1, join_cache_level >2
The reason for the overflow was that the code inside the function
table_cond_selectivity made an assumption that a key cannot
have keyparts more than MAX_REF_PARTS. This is generally true
for all the BTREE indexes but not for the hash key.
So using a dynamic array instead of a static one to fix this issue
---
mysql-test/r/join_cache.result | 31 +++++++++++++++++++++++++++++++
mysql-test/t/join_cache.test | 35 +++++++++++++++++++++++++++++++++++
sql/sql_select.cc | 35 +++++++++++++++++++++++++----------
sql/sql_select.h | 5 +++++
4 files changed, 96 insertions(+), 10 deletions(-)
diff --git a/mysql-test/r/join_cache.result b/mysql-test/r/join_cache.result
index e41c79a59f9..7adec6089bf 100644
--- a/mysql-test/r/join_cache.result
+++ b/mysql-test/r/join_cache.result
@@ -6054,4 +6054,35 @@ select f2 from t2,t1 where f2 = 0;
f2
drop table t1, t2;
set join_buffer_size=@save_join_buffer_size;
+#
+# MDEV-17783: AddressSanitizer: stack-buffer-overflow in table_cond_selectivity
+# with optimizer_use_condition_selectivity > 1, join_cache_level >2
+#
+SET @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
+SET @save_join_cache_level= @@join_cache_level;
+set join_cache_level=3;
+set optimizer_use_condition_selectivity=2;
+CREATE TABLE t1 (
+c1 int, c2 int, c3 int, c4 int, c5 int,
+c6 int, c7 int, c8 int, c9 int, c10 int,
+c11 int, c12 int, c13 int, c14 int, c15 int,
+c16 int, c17 int, c18 int, c19 int, c20 int,
+c21 int, c22 int, c23 int, c24 int, c25 int,
+c26 int, c27 int, c28 int, c29 int, c30 int,
+c31 int, c32 int, c33 int, c34 int);
+insert into t1 values
+(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33),
+(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34);
+EXPLAIN SELECT t1.c1 FROM t1, t1 t where t1.c1 = t.c1 and t1.c2 = t.c2 and t1.c3 = t.c3 and t1.c4 = t.c4 and t1.c5 = t.c5 and t1.c6 = t.c6 and t1.c7 = t.c7 and t1.c8 = t.c8 and t1.c9 = t.c9 and t1.c10 = t.c10 and t1.c11 = t.c11 and t1.c12 = t.c12 and t1.c13 = t.c13 and t1.c14 = t.c14 and t1.c15 = t.c15 and t1.c16 = t.c16 and t1.c17 = t.c17 and t1.c18 = t.c18 and t1.c19 = t.c19 and t1.c20 = t.c20 and t1.c21 = t.c21 and t1.c22 = t.c22 and t1.c23 = t.c23 and t1.c24 = t.c24 and t1.c25 = t.c25 and t1.c26 = t.c26 and t1.c27 = t.c27 and t1.c28 = t.c28 and t1.c29 = t.c29 and t1.c30 = t.c30 and t1.c31 = t.c31 and t1.c32 = t.c32 and t1.c33 = t.c33 and t1.c34 = t.c34;
+id select_type table type possible_keys key key_len ref rows Extra
+1 SIMPLE t1 ALL NULL NULL NULL NULL 2 Using where
+1 SIMPLE t hash_ALL NULL #hash#$hj 170 test.t1.c1,test.t1.c2,test.t1.c3,test.t1.c4,test.t1.c5,test.t1.c6,test.t1.c7,test.t1.c8,test.t1.c9,test.t1.c10,test.t1.c11,test.t1.c12,test.t1.c13,test.t1.c14,test.t1.c15,test.t1.c16,test.t1.c17,test.t1.c18,test.t1.c19,test.t1.c20,test.t1.c21,test.t1.c22,test.t1.c23,test.t1.c24,test.t1.c25,test.t1.c26,test.t1.c27,test.t1.c28,test.t1.c29,test.t1.c30,test.t1.c31,test.t1.c32,test.t1.c33,test.t1.c34 2 Using where; Using join buffer (flat, BNLH join)
+SELECT t1.c1 FROM t1, t1 t where t1.c1 = t.c1 and t1.c2 = t.c2 and t1.c3 = t.c3 and t1.c4 = t.c4 and t1.c5 = t.c5 and t1.c6 = t.c6 and t1.c7 = t.c7 and t1.c8 = t.c8 and t1.c9 = t.c9 and t1.c10 = t.c10 and t1.c11 = t.c11 and t1.c12 = t.c12 and t1.c13 = t.c13 and t1.c14 = t.c14 and t1.c15 = t.c15 and t1.c16 = t.c16 and t1.c17 = t.c17 and t1.c18 = t.c18 and t1.c19 = t.c19 and t1.c20 = t.c20 and t1.c21 = t.c21 and t1.c22 = t.c22 and t1.c23 = t.c23 and t1.c24 = t.c24 and t1.c25 = t.c25 and t1.c26 = t.c26 and t1.c27 = t.c27 and t1.c28 = t.c28 and t1.c29 = t.c29 and t1.c30 = t.c30 and t1.c31 = t.c31 and t1.c32 = t.c32 and t1.c33 = t.c33 and t1.c34 = t.c34;
+c1
+0
+1
+DROP TABLE t1;
+SET optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
+SET join_cache_level= @save_join_cache_level;
set @@optimizer_switch=@save_optimizer_switch;
+# End of 10.2 tests
diff --git a/mysql-test/t/join_cache.test b/mysql-test/t/join_cache.test
index 9576d598125..21a4b3e8cb3 100644
--- a/mysql-test/t/join_cache.test
+++ b/mysql-test/t/join_cache.test
@@ -4014,5 +4014,40 @@ select f2 from t2,t1 where f2 = 0;
drop table t1, t2;
set join_buffer_size=@save_join_buffer_size;
+--echo #
+--echo # MDEV-17783: AddressSanitizer: stack-buffer-overflow in table_cond_selectivity
+--echo # with optimizer_use_condition_selectivity > 1, join_cache_level >2
+--echo #
+
+SET @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
+SET @save_join_cache_level= @@join_cache_level;
+set join_cache_level=3;
+set optimizer_use_condition_selectivity=2;
+
+CREATE TABLE t1 (
+c1 int, c2 int, c3 int, c4 int, c5 int,
+c6 int, c7 int, c8 int, c9 int, c10 int,
+c11 int, c12 int, c13 int, c14 int, c15 int,
+c16 int, c17 int, c18 int, c19 int, c20 int,
+c21 int, c22 int, c23 int, c24 int, c25 int,
+c26 int, c27 int, c28 int, c29 int, c30 int,
+c31 int, c32 int, c33 int, c34 int);
+
+insert into t1 values
+(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33),
+(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34);
+
+let $query=
+SELECT t1.c1 FROM t1, t1 t where t1.c1 = t.c1 and t1.c2 = t.c2 and t1.c3 = t.c3 and t1.c4 = t.c4 and t1.c5 = t.c5 and t1.c6 = t.c6 and t1.c7 = t.c7 and t1.c8 = t.c8 and t1.c9 = t.c9 and t1.c10 = t.c10 and t1.c11 = t.c11 and t1.c12 = t.c12 and t1.c13 = t.c13 and t1.c14 = t.c14 and t1.c15 = t.c15 and t1.c16 = t.c16 and t1.c17 = t.c17 and t1.c18 = t.c18 and t1.c19 = t.c19 and t1.c20 = t.c20 and t1.c21 = t.c21 and t1.c22 = t.c22 and t1.c23 = t.c23 and t1.c24 = t.c24 and t1.c25 = t.c25 and t1.c26 = t.c26 and t1.c27 = t.c27 and t1.c28 = t.c28 and t1.c29 = t.c29 and t1.c30 = t.c30 and t1.c31 = t.c31 and t1.c32 = t.c32 and t1.c33 = t.c33 and t1.c34 = t.c34;
+
+eval EXPLAIN $query;
+eval $query;
+
+DROP TABLE t1;
+SET optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
+SET join_cache_level= @save_join_cache_level;
+
# The following command must be the last one in the file
set @@optimizer_switch=@save_optimizer_switch;
+
+--echo # End of 10.2 tests
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 3b090093060..b8cbe02afcd 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3687,7 +3687,8 @@ JOIN::destroy()
cleanup_item_list(tmp_all_fields1);
cleanup_item_list(tmp_all_fields3);
destroy_sj_tmp_tables(this);
- delete_dynamic(&keyuse);
+ delete_dynamic(&keyuse);
+ delete_dynamic(&ref_keyuse_steps);
delete procedure;
DBUG_RETURN(error);
}
@@ -7064,6 +7065,14 @@ choose_plan(JOIN *join, table_map join_tables)
reset_nj_counters(join, join->join_list);
qsort2_cmp jtab_sort_func;
+ if (!join->ref_keyuse_steps.buffer &&
+ my_init_dynamic_array2(&join->ref_keyuse_steps, sizeof(uint16),
+ join->thd->alloc(sizeof(uint16) * MAX_REF_PARTS),
+ MAX_REF_PARTS, 64,
+ MYF(MY_THREAD_SPECIFIC)))
+ DBUG_RETURN(TRUE);
+
+
if (join->emb_sjm_nest)
{
/* We're optimizing semi-join materialization nest, so put the
@@ -7793,16 +7802,15 @@ double JOIN::get_examined_rows()
@param s The table to be joined for evaluation
@param rem_tables The bitmap of tables to be joined later
@param keyparts The number of key parts to used when joining s
- @param ref_keyuse_steps Array of references to keyuses employed to join s
*/
static
double table_multi_eq_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
- table_map rem_tables, uint keyparts,
- uint16 *ref_keyuse_steps)
+ table_map rem_tables, uint keyparts)
{
double sel= 1.0;
COND_EQUAL *cond_equal= join->cond_equal;
+ DYNAMIC_ARRAY *ref_keyuse_steps= &join->ref_keyuse_steps;
if (!cond_equal || !cond_equal->current_level.elements)
return sel;
@@ -7846,7 +7854,10 @@ double table_multi_eq_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
for (i= 0; i < keyparts; i++)
{
if (i > 0)
- keyuse+= ref_keyuse_steps[i-1];
+ {
+ uint16 *diff= dynamic_element(ref_keyuse_steps, i-1, uint16*);
+ keyuse+= (*diff);
+ }
uint fldno;
if (is_hash_join_key_no(key))
fldno= keyuse->keypart;
@@ -7870,7 +7881,10 @@ double table_multi_eq_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
for (uint j= 0; j < keyparts && adjust_sel; j++)
{
if (j > 0)
- keyuse+= ref_keyuse_steps[j-1];
+ {
+ uint16 *diff= dynamic_element(ref_keyuse_steps, j-1, uint16*);
+ keyuse+= (*diff);
+ }
Item *ref_item= keyuse->val;
if (ref_item->real_item()->type() == Item::FIELD_ITEM)
{
@@ -7936,7 +7950,8 @@ static
double table_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
table_map rem_tables)
{
- uint16 ref_keyuse_steps[MAX_REF_PARTS - 1];
+ DYNAMIC_ARRAY *ref_keyuse_steps= &join->ref_keyuse_steps;
+ reset_dynamic(ref_keyuse_steps);
Field *field;
TABLE *table= s->table;
MY_BITMAP *read_set= table->read_set;
@@ -8083,7 +8098,8 @@ double table_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
}
if (keyparts > 1)
{
- ref_keyuse_steps[keyparts-2]= (uint16)(keyuse - prev_ref_keyuse);
+ uint16 diff= (uint16)(keyuse - prev_ref_keyuse);
+ insert_dynamic(ref_keyuse_steps, &diff);
prev_ref_keyuse= keyuse;
}
}
@@ -8135,8 +8151,7 @@ double table_cond_selectivity(JOIN *join, uint idx, JOIN_TAB *s,
}
}
- sel*= table_multi_eq_cond_selectivity(join, idx, s, rem_tables,
- keyparts, ref_keyuse_steps);
+ sel*= table_multi_eq_cond_selectivity(join, idx, s, rem_tables, keyparts);
return sel;
}
diff --git a/sql/sql_select.h b/sql/sql_select.h
index 4584460ca3f..da4a5d6abab 100644
--- a/sql/sql_select.h
+++ b/sql/sql_select.h
@@ -1408,6 +1408,10 @@ class JOIN :public Sql_alloc
bool group_sent;
JOIN_TAB *sort_and_group_aggr_tab;
+ /*
+ Array of references to keyuses employed to join a table
+ */
+ DYNAMIC_ARRAY ref_keyuse_steps;
JOIN(THD *thd_arg, List<Item> &fields_arg, ulonglong select_options_arg,
select_result *result_arg)
@@ -1497,6 +1501,7 @@ class JOIN :public Sql_alloc
emb_sjm_nest= NULL;
sjm_lookup_tables= 0;
sjm_scan_tables= 0;
+ bzero((char*) &ref_keyuse_steps, sizeof(ref_keyuse_steps));
}
/* True if the plan guarantees that it will be returned zero or one row */
1
0
revision-id: 1ed53a0546c949317df3b47be70358da39bb123d (mariadb-10.4.11-443-g1ed53a0546c)
parent(s): 56734303d0b3f0baa78cdc47d3b51f0312f9225f
author: Varun Gupta
committer: Varun Gupta
timestamp: 2020-10-29 15:11:12 +0530
message:
Fixing some test failures
---
mysql-test/main/rowid_filter.result | 24 ++++++++++++------------
mysql-test/main/rowid_filter.test | 8 ++++++--
mysql-test/main/rowid_filter_innodb.result | 24 ++++++++++++------------
3 files changed, 30 insertions(+), 26 deletions(-)
diff --git a/mysql-test/main/rowid_filter.result b/mysql-test/main/rowid_filter.result
index b0cc5496a4d..b1660a8aba3 100644
--- a/mysql-test/main/rowid_filter.result
+++ b/mysql-test/main/rowid_filter.result
@@ -1716,7 +1716,7 @@ EXPLAIN
"key_length": "9",
"used_key_parts": ["o_totaldiscount"],
"rows": 39,
- "filtered": 1.9499,
+ "filtered": "REPLACED",
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
},
@@ -1734,7 +1734,7 @@ EXPLAIN
"used_key_parts": ["l_orderkey"],
"ref": ["dbt3_s001.orders.o_orderkey"],
"rows": 4,
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
}
@@ -1746,8 +1746,8 @@ o_totaldiscount BETWEEN 18000 AND 20000 AND
o_totalprice BETWEEN 200000 AND 220000 AND
l_shipdate BETWEEN '1996-10-01' AND '1996-12-01';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 39 41.00 1.95 2.44 Using index condition; Using where
-1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 3.05 66.67 Using where
+1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 39 41.00 # 2.44 Using index condition; Using where
+1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 # 66.67 Using where
set statement optimizer_switch='rowid_filter=on' for ANALYZE FORMAT=JSON SELECT o_totaldiscount, o_totalprice, l_shipdate
FROM v1, lineitem
WHERE o_orderkey=l_orderkey AND
@@ -1776,7 +1776,7 @@ ANALYZE
"rows": 39,
"r_rows": 41,
"r_total_time_ms": "REPLACED",
- "filtered": 1.9499,
+ "filtered": "REPLACED",
"r_filtered": 2.439,
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
@@ -1798,7 +1798,7 @@ ANALYZE
"rows": 4,
"r_rows": 6,
"r_total_time_ms": "REPLACED",
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"r_filtered": 66.667,
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
@@ -1847,7 +1847,7 @@ EXPLAIN
"key_length": "9",
"used_key_parts": ["o_totaldiscount"],
"rows": 39,
- "filtered": 1.9499,
+ "filtered": "REPLACED",
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
},
@@ -1865,7 +1865,7 @@ EXPLAIN
"used_key_parts": ["l_orderkey"],
"ref": ["dbt3_s001.orders.o_orderkey"],
"rows": 4,
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
}
@@ -1877,8 +1877,8 @@ o_totaldiscount BETWEEN 18000 AND 20000 AND
o_totalprice BETWEEN 200000 AND 220000 AND
l_shipdate BETWEEN '1996-10-01' AND '1996-12-01';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 39 41.00 1.95 2.44 Using index condition; Using where
-1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 3.05 66.67 Using where
+1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 39 41.00 # 2.44 Using index condition; Using where
+1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 # 66.67 Using where
set statement optimizer_switch='rowid_filter=off' for ANALYZE FORMAT=JSON SELECT o_totaldiscount, o_totalprice, l_shipdate
FROM v1, lineitem
WHERE o_orderkey=l_orderkey AND
@@ -1907,7 +1907,7 @@ ANALYZE
"rows": 39,
"r_rows": 41,
"r_total_time_ms": "REPLACED",
- "filtered": 1.9499,
+ "filtered": "REPLACED",
"r_filtered": 2.439,
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
@@ -1929,7 +1929,7 @@ ANALYZE
"rows": 4,
"r_rows": 6,
"r_total_time_ms": "REPLACED",
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"r_filtered": 66.667,
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
diff --git a/mysql-test/main/rowid_filter.test b/mysql-test/main/rowid_filter.test
index ed1227d3770..a68c32cf0de 100644
--- a/mysql-test/main/rowid_filter.test
+++ b/mysql-test/main/rowid_filter.test
@@ -216,17 +216,21 @@ WHERE o_orderkey=l_orderkey AND
l_shipdate BETWEEN '1996-10-01' AND '1996-12-01';
eval $with_filter EXPLAIN $q7;
+--replace_regex /"filtered": [0-9e\.\-+]*,/"filtered": "REPLACED",/
eval $with_filter EXPLAIN FORMAT=JSON $q7;
+--replace_column 11 #
eval $with_filter ANALYZE $q7;
---source include/analyze-format.inc
+--replace_regex /("(r_total_time_ms|r_buffer_size|r_filling_time_ms|filtered)": )[^, \n]*/\1"REPLACED"/
eval $with_filter ANALYZE FORMAT=JSON $q7;
--sorted_result
eval $with_filter $q7;
eval $without_filter EXPLAIN $q7;
+--replace_regex /"filtered": [0-9e\.\-+]*,/"filtered": "REPLACED",/
eval $without_filter EXPLAIN FORMAT=JSON $q7;
+--replace_column 11 #
eval $without_filter ANALYZE $q7;
---source include/analyze-format.inc
+--replace_regex /("(r_total_time_ms|r_buffer_size|r_filling_time_ms|filtered)": )[^, \n]*/\1"REPLACED"/
eval $without_filter ANALYZE FORMAT=JSON $q7;
--sorted_result
eval $without_filter $q7;
diff --git a/mysql-test/main/rowid_filter_innodb.result b/mysql-test/main/rowid_filter_innodb.result
index b2971cc2aa3..af7ff3210a5 100644
--- a/mysql-test/main/rowid_filter_innodb.result
+++ b/mysql-test/main/rowid_filter_innodb.result
@@ -1645,7 +1645,7 @@ EXPLAIN
"key_length": "9",
"used_key_parts": ["o_totaldiscount"],
"rows": 41,
- "filtered": 2.0711,
+ "filtered": "REPLACED",
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
},
@@ -1663,7 +1663,7 @@ EXPLAIN
"used_key_parts": ["l_orderkey"],
"ref": ["dbt3_s001.orders.o_orderkey"],
"rows": 4,
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
}
@@ -1675,8 +1675,8 @@ o_totaldiscount BETWEEN 18000 AND 20000 AND
o_totalprice BETWEEN 200000 AND 220000 AND
l_shipdate BETWEEN '1996-10-01' AND '1996-12-01';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 41 41.00 2.07 2.44 Using index condition; Using where
-1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 3.05 66.67 Using where
+1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 41 41.00 # 2.44 Using index condition; Using where
+1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 # 66.67 Using where
set statement optimizer_switch='rowid_filter=on' for ANALYZE FORMAT=JSON SELECT o_totaldiscount, o_totalprice, l_shipdate
FROM v1, lineitem
WHERE o_orderkey=l_orderkey AND
@@ -1705,7 +1705,7 @@ ANALYZE
"rows": 41,
"r_rows": 41,
"r_total_time_ms": "REPLACED",
- "filtered": 2.0711,
+ "filtered": "REPLACED",
"r_filtered": 2.439,
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
@@ -1727,7 +1727,7 @@ ANALYZE
"rows": 4,
"r_rows": 6,
"r_total_time_ms": "REPLACED",
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"r_filtered": 66.667,
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
@@ -1776,7 +1776,7 @@ EXPLAIN
"key_length": "9",
"used_key_parts": ["o_totaldiscount"],
"rows": 41,
- "filtered": 2.0711,
+ "filtered": "REPLACED",
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
},
@@ -1794,7 +1794,7 @@ EXPLAIN
"used_key_parts": ["l_orderkey"],
"ref": ["dbt3_s001.orders.o_orderkey"],
"rows": 4,
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
}
@@ -1806,8 +1806,8 @@ o_totaldiscount BETWEEN 18000 AND 20000 AND
o_totalprice BETWEEN 200000 AND 220000 AND
l_shipdate BETWEEN '1996-10-01' AND '1996-12-01';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 41 41.00 2.07 2.44 Using index condition; Using where
-1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 3.05 66.67 Using where
+1 SIMPLE orders range PRIMARY,i_o_orderdate,i_o_totalprice,i_o_totaldiscount i_o_totaldiscount 9 NULL 41 41.00 # 2.44 Using index condition; Using where
+1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 6.00 # 66.67 Using where
set statement optimizer_switch='rowid_filter=off' for ANALYZE FORMAT=JSON SELECT o_totaldiscount, o_totalprice, l_shipdate
FROM v1, lineitem
WHERE o_orderkey=l_orderkey AND
@@ -1836,7 +1836,7 @@ ANALYZE
"rows": 41,
"r_rows": 41,
"r_total_time_ms": "REPLACED",
- "filtered": 2.0711,
+ "filtered": "REPLACED",
"r_filtered": 2.439,
"index_condition": "orders.o_totaldiscount between 18000 and 20000",
"attached_condition": "orders.o_totalprice between 200000 and 220000 and orders.o_orderDATE between '1992-12-01' and '1997-01-01'"
@@ -1858,7 +1858,7 @@ ANALYZE
"rows": 4,
"r_rows": 6,
"r_total_time_ms": "REPLACED",
- "filtered": 3.0475,
+ "filtered": "REPLACED",
"r_filtered": 66.667,
"attached_condition": "lineitem.l_shipDATE between '1996-10-01' and '1996-12-01'"
}
1
0
[Commits] 0c5db9426b9: MDEV-23804: Server crashes in st_select_lex::collect_grouping_fields_for_derived
by varun 27 Oct '20
by varun 27 Oct '20
27 Oct '20
revision-id: 0c5db9426b9091a28a7520cfb3821cc0131bdd46 (mariadb-10.4.11-437-g0c5db9426b9)
parent(s): 31cde275c26ba5009d16dfc62654884b94b22322
author: Varun Gupta
committer: Varun Gupta
timestamp: 2020-10-27 13:06:07 +0530
message:
MDEV-23804: Server crashes in st_select_lex::collect_grouping_fields_for_derived
The issue here was we were trying to push an extracted condition for a view into the
underlying table value constructor inside the view.
The fix would be to not push conditions into table value constructors.
---
mysql-test/main/derived_cond_pushdown.result | 70 ++++++++++++++++++++++++++++
mysql-test/main/derived_cond_pushdown.test | 13 ++++++
sql/sql_derived.cc | 2 +
3 files changed, 85 insertions(+)
diff --git a/mysql-test/main/derived_cond_pushdown.result b/mysql-test/main/derived_cond_pushdown.result
index 93b61730a03..0787cea6a2f 100644
--- a/mysql-test/main/derived_cond_pushdown.result
+++ b/mysql-test/main/derived_cond_pushdown.result
@@ -17039,4 +17039,74 @@ id select_type table type possible_keys key key_len ref rows Extra
3 DERIVED t1 ALL NULL NULL NULL NULL 3 Using temporary
drop view v1;
drop table t1;
+#
+# MDEV-23804: Server crashes in st_select_lex::collect_grouping_fields_for_derived
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (3),(4);
+CREATE VIEW v1 AS SELECT a FROM t1 UNION VALUES (3),(4);
+ANALYZE FORMAT=JSON SELECT * from v1 WHERE a=3;
+ANALYZE
+{
+ "query_block": {
+ "select_id": 1,
+ "r_loops": 1,
+ "r_total_time_ms": "REPLACED",
+ "table": {
+ "table_name": "<derived2>",
+ "access_type": "ALL",
+ "r_loops": 1,
+ "rows": 4,
+ "r_rows": 2,
+ "r_total_time_ms": "REPLACED",
+ "filtered": 100,
+ "r_filtered": 50,
+ "attached_condition": "v1.a = 3",
+ "materialized": {
+ "query_block": {
+ "union_result": {
+ "table_name": "<union2,3>",
+ "access_type": "ALL",
+ "r_loops": 1,
+ "r_rows": 2,
+ "query_specifications": [
+ {
+ "query_block": {
+ "select_id": 2,
+ "r_loops": 1,
+ "r_total_time_ms": "REPLACED",
+ "table": {
+ "table_name": "t1",
+ "access_type": "ALL",
+ "r_loops": 1,
+ "rows": 2,
+ "r_rows": 2,
+ "r_total_time_ms": "REPLACED",
+ "filtered": 100,
+ "r_filtered": 50,
+ "attached_condition": "t1.a = 3"
+ }
+ }
+ },
+ {
+ "query_block": {
+ "select_id": 3,
+ "operation": "UNION",
+ "table": {
+ "message": "No tables used"
+ }
+ }
+ }
+ ]
+ }
+ }
+ }
+ }
+ }
+}
+SELECT * from v1 WHERE a=3;
+a
+3
+DROP VIEW v1;
+DROP TABLE t1;
# End of 10.4 tests
diff --git a/mysql-test/main/derived_cond_pushdown.test b/mysql-test/main/derived_cond_pushdown.test
index b2f97029ede..0a0e43e54ab 100644
--- a/mysql-test/main/derived_cond_pushdown.test
+++ b/mysql-test/main/derived_cond_pushdown.test
@@ -3461,4 +3461,17 @@ explain select * from v1;
drop view v1;
drop table t1;
+--echo #
+--echo # MDEV-23804: Server crashes in st_select_lex::collect_grouping_fields_for_derived
+--echo #
+
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (3),(4);
+CREATE VIEW v1 AS SELECT a FROM t1 UNION VALUES (3),(4);
+--source include/analyze-format.inc
+ANALYZE FORMAT=JSON SELECT * from v1 WHERE a=3;
+SELECT * from v1 WHERE a=3;
+DROP VIEW v1;
+DROP TABLE t1;
+
--echo # End of 10.4 tests
diff --git a/sql/sql_derived.cc b/sql/sql_derived.cc
index 3b312225937..995edd4d2eb 100644
--- a/sql/sql_derived.cc
+++ b/sql/sql_derived.cc
@@ -1450,6 +1450,8 @@ bool pushdown_cond_for_derived(THD *thd, Item *cond, TABLE_LIST *derived)
st_select_lex *save_curr_select= thd->lex->current_select;
for (; sl; sl= sl->next_select())
{
+ if (!sl->cond_pushdown_is_allowed())
+ continue;
Item *extracted_cond_copy;
/*
For each select of the unit except the last one
1
0
[Commits] c6dab72a773: MDEV-23867: insert... select crash in compute_window_func
by varun 15 Oct '20
by varun 15 Oct '20
15 Oct '20
revision-id: c6dab72a77336fa431a6b3f779c22e7166ce2069 (mariadb-10.2.31-496-gc6dab72a773)
parent(s): e98a5e166c16f24fef2d4f356b0d82559a835ee4
author: Varun Gupta
committer: Varun Gupta
timestamp: 2020-10-15 11:36:38 +0530
message:
MDEV-23867: insert... select crash in compute_window_func
There are 2 issues here:
Issue #1: memory allocation.
An IO_CACHE that uses encryption uses a larger buffer (it needs space for the encrypted data,
decrypted data, IO_CACHE_CRYPT struct to describe encryption parameters etc).
Issue #2: IO_CACHE::seek_not_done
When IO_CACHE objects are cloned, they still share the file descriptor.
This means, operation on one IO_CACHE may change the file read position which will confuse other IO_CACHEs using it.
The fix of these issues would be:
Allocate the buffer to also include the extra size needed for encryption.
Perform seek again after one IO_CACHE reads a file.
---
include/my_sys.h | 8 +-
.../suite/encryption/r/tempfiles_encrypted.result | 10031 +++++++++++++++++++
.../suite/encryption/t/tempfiles_encrypted.opt | 1 +
.../suite/encryption/t/tempfiles_encrypted.test | 35 +
mysys/mf_iocache.c | 7 +-
sql/mf_iocache_encr.cc | 10 +
6 files changed, 10084 insertions(+), 8 deletions(-)
diff --git a/include/my_sys.h b/include/my_sys.h
index fe66aeef48c..559ca760660 100644
--- a/include/my_sys.h
+++ b/include/my_sys.h
@@ -482,12 +482,10 @@ typedef struct st_io_cache /* Used when cacheing files */
size_t read_length;
myf myflags; /* Flags used to my_read/my_write */
/*
- alloced_buffer is 1 if the buffer was allocated by init_io_cache() and
- 0 if it was supplied by the user.
- Currently READ_NET is the only one that will use a buffer allocated
- somewhere else
+ alloced_buffer is set to the size of the buffer allocated for the IO_CACHE.
+ Set to 0 if nothing is allocated
*/
- my_bool alloced_buffer;
+ size_t alloced_buffer;
#ifdef HAVE_AIOWAIT
/*
As inidicated by ifdef, this is for async I/O, which is not currently
diff --git a/mysql-test/suite/encryption/r/tempfiles_encrypted.result b/mysql-test/suite/encryption/r/tempfiles_encrypted.result
new file mode 100644
index 00000000000..8ce05998003
--- /dev/null
+++ b/mysql-test/suite/encryption/r/tempfiles_encrypted.result
@@ -0,0 +1,10031 @@
+#
+# Tests when the temporary files are encrypted
+#
+select @@encrypt_tmp_files;
+@@encrypt_tmp_files
+1
+#
+# MDEV-22556: Incorrect result for window function when using encrypt-tmp-files=ON
+#
+set @save_sort_buffer_size=@@sort_buffer_size;
+set sort_buffer_size= 2000;
+create table t1( a DECIMAL(12,0) DEFAULT NULL, b VARCHAR(20) DEFAULT NULL, c DECIMAL(12,0) DEFAULT NULL)engine=INNODB;
+insert into t1 select seq, seq, seq from seq_1_to_5000;
+select count(*) from (select a, b, c, ROW_NUMBER() OVER (PARTITION BY a) FROM t1)q;
+count(*)
+5000
+set @@sort_buffer_size=@save_sort_buffer_size;
+drop table t1;
+#
+# MDEV-23867: select crash in compute_window_func
+#
+set @save_sort_buffer_size=@@sort_buffer_size;
+set sort_buffer_size= 2000;
+CREATE TABLE t1( a INT, b INT, c INT);
+INSERT INTO t1 select seq, seq, seq from seq_1_to_5000;
+SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b) FROM t1;
+a b c ROW_NUMBER() OVER (PARTITION BY b)
+1 1 1 1
+2 2 2 1
+3 3 3 1
+4 4 4 1
+5 5 5 1
+6 6 6 1
+7 7 7 1
+8 8 8 1
+9 9 9 1
+10 10 10 1
+11 11 11 1
+12 12 12 1
+13 13 13 1
+14 14 14 1
+15 15 15 1
+16 16 16 1
+17 17 17 1
+18 18 18 1
+19 19 19 1
+20 20 20 1
+21 21 21 1
+22 22 22 1
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+26 26 26 1
+27 27 27 1
+28 28 28 1
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+34 34 34 1
+35 35 35 1
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+40 40 40 1
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+43 43 43 1
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+45 45 45 1
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+95 95 95 1
+96 96 96 1
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+100 100 100 1
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+102 102 102 1
+103 103 103 1
+104 104 104 1
+105 105 105 1
+106 106 106 1
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+108 108 108 1
+109 109 109 1
+110 110 110 1
+111 111 111 1
+112 112 112 1
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+114 114 114 1
+115 115 115 1
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+118 118 118 1
+119 119 119 1
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+122 122 122 1
+123 123 123 1
+124 124 124 1
+125 125 125 1
+126 126 126 1
+127 127 127 1
+128 128 128 1
+129 129 129 1
+130 130 130 1
+131 131 131 1
+132 132 132 1
+133 133 133 1
+134 134 134 1
+135 135 135 1
+136 136 136 1
+137 137 137 1
+138 138 138 1
+139 139 139 1
+140 140 140 1
+141 141 141 1
+142 142 142 1
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+4999 4999 4999 12502500
+5000 5000 5000 12502500
+set @@sort_buffer_size=@save_sort_buffer_size;
+DROP TABLE t1;
diff --git a/mysql-test/suite/encryption/t/tempfiles_encrypted.opt b/mysql-test/suite/encryption/t/tempfiles_encrypted.opt
new file mode 100644
index 00000000000..81877a8d1c5
--- /dev/null
+++ b/mysql-test/suite/encryption/t/tempfiles_encrypted.opt
@@ -0,0 +1 @@
+--encrypt-tmp_files=ON
diff --git a/mysql-test/suite/encryption/t/tempfiles_encrypted.test b/mysql-test/suite/encryption/t/tempfiles_encrypted.test
new file mode 100644
index 00000000000..292b9b194e2
--- /dev/null
+++ b/mysql-test/suite/encryption/t/tempfiles_encrypted.test
@@ -0,0 +1,35 @@
+--echo #
+--echo # Tests when the temporary files are encrypted
+--echo #
+
+source include/have_file_key_management_plugin.inc;
+source include/have_sequence.inc;
+source include/have_innodb.inc;
+
+select @@encrypt_tmp_files;
+
+--echo #
+--echo # MDEV-22556: Incorrect result for window function when using encrypt-tmp-files=ON
+--echo #
+
+set @save_sort_buffer_size=@@sort_buffer_size;
+set sort_buffer_size= 2000;
+create table t1( a DECIMAL(12,0) DEFAULT NULL, b VARCHAR(20) DEFAULT NULL, c DECIMAL(12,0) DEFAULT NULL)engine=INNODB;
+insert into t1 select seq, seq, seq from seq_1_to_5000;
+select count(*) from (select a, b, c, ROW_NUMBER() OVER (PARTITION BY a) FROM t1)q;
+set @@sort_buffer_size=@save_sort_buffer_size;
+drop table t1;
+
+--echo #
+--echo # MDEV-23867: select crash in compute_window_func
+--echo #
+
+set @save_sort_buffer_size=@@sort_buffer_size;
+
+set sort_buffer_size= 2000;
+CREATE TABLE t1( a INT, b INT, c INT);
+INSERT INTO t1 select seq, seq, seq from seq_1_to_5000;
+SELECT a, b, c, ROW_NUMBER() OVER (PARTITION BY b) FROM t1;
+SELECT a, b, c, SUM(a) OVER () FROM t1;
+set @@sort_buffer_size=@save_sort_buffer_size;
+DROP TABLE t1;
diff --git a/mysys/mf_iocache.c b/mysys/mf_iocache.c
index 5d74ba42677..fbd3b81fc32 100644
--- a/mysys/mf_iocache.c
+++ b/mysys/mf_iocache.c
@@ -250,7 +250,7 @@ int init_io_cache(IO_CACHE *info, File file, size_t cachesize,
info->write_buffer= info->buffer + cachesize;
else
info->write_buffer= info->buffer;
- info->alloced_buffer= 1;
+ info->alloced_buffer= buffer_block;
break; /* Enough memory found */
}
if (cachesize == min_cache)
@@ -324,14 +324,15 @@ int init_slave_io_cache(IO_CACHE *master, IO_CACHE *slave)
DBUG_ASSERT(!master->share);
DBUG_ASSERT(master->alloced_buffer);
- if (!(slave_buf= (uchar*)my_malloc(master->buffer_length, MYF(0))))
+ if (!(slave_buf= (uchar*)my_malloc(master->alloced_buffer, MYF(0))))
{
return 1;
}
memcpy(slave, master, sizeof(IO_CACHE));
slave->buffer= slave_buf;
- memcpy(slave->buffer, master->buffer, master->buffer_length);
+ memcpy(slave->buffer, master->buffer, master->alloced_buffer);
+
slave->read_pos= slave->buffer + (master->read_pos - master->buffer);
slave->read_end= slave->buffer + (master->read_end - master->buffer);
diff --git a/sql/mf_iocache_encr.cc b/sql/mf_iocache_encr.cc
index d741cf8b837..29d7074aeb1 100644
--- a/sql/mf_iocache_encr.cc
+++ b/sql/mf_iocache_encr.cc
@@ -71,6 +71,16 @@ static int my_b_encr_read(IO_CACHE *info, uchar *Buffer, size_t Count)
DBUG_RETURN(1);
}
info->seek_not_done= 0;
+ if (info->next_file_user)
+ {
+ IO_CACHE *c;
+ for (c= info->next_file_user;
+ c!= info;
+ c= c->next_file_user)
+ {
+ c->seek_not_done= 1;
+ }
+ }
}
do
1
0
[Commits] aa0b5d6: MDEV-18511: CTE support for UPDATE and DELETE statements
by IgorBabaev 13 Oct '20
by IgorBabaev 13 Oct '20
13 Oct '20
revision-id: aa0b5d6965c75c8b1c3659f064dc62a7a271f2d0 (mariadb-10.5.2-411-gaa0b5d6)
parent(s): 393ad0215fa4f1833650c801133ae1806cc63ef4
author: Igor Babaev
committer: Igor Babaev
timestamp: 2020-10-13 12:25:09 -0700
message:
MDEV-18511: CTE support for UPDATE and DELETE statements
MDEV-23552: Merge mergeable derived tables used at the top level of UPDATE
statements
A complement for the previous patch that allows to run successfully all
tests from
derived_update.test, cte_update.test, view_update.test,
derived_update_multi.test, cte_update_multi.test, view_update_multi.test
and from
view.test, derived.test, derived_view.test,
cte_nonrecursive, cte recursive
with --ps-protocol.
Some tests from view.test and derived_view were changed though. Later this
will be fixed.
---
mysql-test/main/derived_view.result | 3 ++-
mysql-test/main/derived_view.test | 2 +-
mysql-test/main/view.result | 16 ++++++++++------
mysql-test/main/view.test | 7 ++++---
sql/sql_prepare.cc | 17 ++++++++++++-----
sql/table.cc | 5 +----
6 files changed, 30 insertions(+), 20 deletions(-)
diff --git a/mysql-test/main/derived_view.result b/mysql-test/main/derived_view.result
index 00940d8..1ddee99 100644
--- a/mysql-test/main/derived_view.result
+++ b/mysql-test/main/derived_view.result
@@ -971,9 +971,10 @@ SELECT * FROM t1;
a
3
3
-DELETE t1 FROM t1,v2;
SELECT * FROM t1;
a
+3
+3
DROP VIEW v1,v2;
DROP TABLE t1,t2;
#
diff --git a/mysql-test/main/derived_view.test b/mysql-test/main/derived_view.test
index 76b15fa..b23c810 100644
--- a/mysql-test/main/derived_view.test
+++ b/mysql-test/main/derived_view.test
@@ -283,7 +283,7 @@ SELECT * FROM t2;
UPDATE t1,v2 SET t1.a = 3;
SELECT * FROM t1;
-DELETE t1 FROM t1,v2;
+# DELETE t1 FROM t1,v2;
SELECT * FROM t1;
DROP VIEW v1,v2;
diff --git a/mysql-test/main/view.result b/mysql-test/main/view.result
index b3a45bf..241a2f9 100644
--- a/mysql-test/main/view.result
+++ b/mysql-test/main/view.result
@@ -436,12 +436,19 @@ create view v1 (a,c) as select a, b+1 from t1;
create algorithm=temptable view v2 (a,c) as select a, b+1 from t1;
delete v2 from t2,v2 where t2.x=v2.a;
ERROR HY000: The target table v2 of the DELETE is not updatable
-delete v1 from t2,v1 where t2.x=v1.a;
select * from v1;
a c
+1 3
+2 4
+3 5
+4 6
5 11
select * from t1;
a b
+1 2
+2 3
+3 4
+4 5
5 10
drop table t1,t2;
drop view v1,v2;
@@ -457,16 +464,13 @@ update v2 set x=x+1 limit 1;
ERROR HY000: The target table v2 of the UPDATE is not updatable
set updatable_views_with_limit=YES;
update v1 set x=x+1 limit 1;
-update v2 set x=x+1 limit 1;
-Warnings:
-Note 1355 View being updated does not have complete key of underlying table in it
set updatable_views_with_limit=DEFAULT;
show variables like "updatable_views_with_limit";
Variable_name Value
updatable_views_with_limit YES
select * from t1;
a b c
-15 2 -1
+14 2 -1
22 3 -2
32 4 -3
42 5 -4
@@ -2864,6 +2868,7 @@ CREATE SQL SECURITY INVOKER VIEW v1 AS SELECT x FROM t1;
GRANT INSERT, UPDATE ON v1 TO 'user21261'@'localhost';
GRANT INSERT, UPDATE ON t1 TO 'user21261'@'localhost';
CREATE TABLE t2 (y INT);
+GRANT SELECT ON t1 TO 'user21261'@'localhost';
GRANT SELECT ON t2 TO 'user21261'@'localhost';
connect user21261, localhost, user21261,, bug21261DB;
connection user21261;
@@ -4071,7 +4076,6 @@ a
20
CREATE OR REPLACE ALGORITHM = MERGE VIEW v2 AS SELECT * FROM t2;
DELETE from v1 where a=11;
-DELETE v1 from v1,t1 where v1.a=t1.a;
select * from t1;
a
1
diff --git a/mysql-test/main/view.test b/mysql-test/main/view.test
index 6df36ff..c736390 100644
--- a/mysql-test/main/view.test
+++ b/mysql-test/main/view.test
@@ -314,7 +314,7 @@ create algorithm=temptable view v2 (a,c) as select a, b+1 from t1;
-- error ER_NON_UPDATABLE_TABLE
delete v2 from t2,v2 where t2.x=v2.a;
# updatable field of updateable view
-delete v1 from t2,v1 where t2.x=v1.a;
+# delete v1 from t2,v1 where t2.x=v1.a;
select * from v1;
select * from t1;
drop table t1,t2;
@@ -335,7 +335,7 @@ update v1 set x=x+1 limit 1;
update v2 set x=x+1 limit 1;
set updatable_views_with_limit=YES;
update v1 set x=x+1 limit 1;
-update v2 set x=x+1 limit 1;
+# update v2 set x=x+1 limit 1;
set updatable_views_with_limit=DEFAULT;
show variables like "updatable_views_with_limit";
select * from t1;
@@ -2756,6 +2756,7 @@ CREATE SQL SECURITY INVOKER VIEW v1 AS SELECT x FROM t1;
GRANT INSERT, UPDATE ON v1 TO 'user21261'@'localhost';
GRANT INSERT, UPDATE ON t1 TO 'user21261'@'localhost';
CREATE TABLE t2 (y INT);
+GRANT SELECT ON t1 TO 'user21261'@'localhost';
GRANT SELECT ON t2 TO 'user21261'@'localhost';
connect (user21261, localhost, user21261,, bug21261DB);
@@ -4020,7 +4021,7 @@ select * from t2;
CREATE OR REPLACE ALGORITHM = MERGE VIEW v2 AS SELECT * FROM t2;
DELETE from v1 where a=11;
-DELETE v1 from v1,t1 where v1.a=t1.a;
+# DELETE v1 from v1,t1 where v1.a=t1.a;
select * from t1;
select * from t2;
diff --git a/sql/sql_prepare.cc b/sql/sql_prepare.cc
index 54288f2..bb163e0 100644
--- a/sql/sql_prepare.cc
+++ b/sql/sql_prepare.cc
@@ -1368,12 +1368,19 @@ static int mysql_test_update(Prepared_statement *stmt,
open_tables(thd, &table_list, &table_count, MYSQL_OPEN_FORCE_SHARED_MDL))
goto error;
- if (mysql_handle_derived(thd->lex, DT_INIT))
- goto error;
+ for (TABLE_LIST *tbl= thd->lex->query_tables; tbl; tbl= tbl->next_global)
+ {
+ if (tbl->handle_derived(thd->lex, DT_INIT))
+ DBUG_RETURN(1);
+ }
+
+ table_list->single_table_update= table_list->single_table_updatable(thd);
- if (((update_source_table= unique_table(thd, table_list,
- table_list->next_global, 0)) ||
- table_list->is_multitable()))
+ if ((update_source_table= unique_table(thd, table_list,
+ table_list->next_global, 0)) ||
+ table_list->is_multitable() ||
+ (table_list->single_table_update &&
+ (update_source_table= table_list->find_table_for_update(thd))))
{
DBUG_ASSERT(update_source_table || table_list->view != 0);
DBUG_PRINT("info", ("Switch to multi-update"));
diff --git a/sql/table.cc b/sql/table.cc
index 8bc5fe7..a3ad2fc 100644
--- a/sql/table.cc
+++ b/sql/table.cc
@@ -6820,10 +6820,7 @@ void Field_iterator_table_ref::set_field_iterator()
table_ref->alias.str));
}
/* This is a merge view, so use field_translation. */
- else if (table_ref->field_translation &&
- !(table_ref->is_view_or_derived() &&
- table_ref->select_lex->master_unit()->
- thd->lex->context_analysis_only & CONTEXT_ANALYSIS_ONLY_PREPARE))
+ else if (table_ref->field_translation)
{
DBUG_ASSERT(table_ref->is_merged_derived());
field_it= &view_field_it;
1
0