Hi, Nikita!
On Mar 10, Nikita Malyavin wrote:
revision-id: bbe056ac3fa (mariadb-10.5.0-273-gbbe056ac3fa) parent(s): 7a5d3316805 author: Nikita Malyavin <nikitamalyavin@gmail.com> committer: Nikita Malyavin <nikitamalyavin@gmail.com> timestamp: 2020-03-11 00:46:24 +1000 message:
support NULL fields in key
--- mysql-test/suite/period/r/overlaps.result | 18 ++++++++++++++++-- mysql-test/suite/period/t/overlaps.test | 16 +++++++++++++++- sql/handler.cc | 18 ++++++++++++++---- sql/sql_table.cc | 29 +++++++---------------------- 4 files changed, 52 insertions(+), 29 deletions(-)
diff --git a/mysql-test/suite/period/r/overlaps.result b/mysql-test/suite/period/r/overlaps.result index cf980afd7f0..e52b21496b5 100644 --- a/mysql-test/suite/period/r/overlaps.result +++ b/mysql-test/suite/period/r/overlaps.result @@ -104,16 +104,30 @@ show create table t; Table Create Table t CREATE TABLE `t` ( `id` int(11) NOT NULL, - `u` int(11) NOT NULL, + `u` int(11) DEFAULT NULL, `s` date NOT NULL, `e` date NOT NULL, PERIOD FOR `p` (`s`, `e`), PRIMARY KEY (`id`,`p` WITHOUT OVERLAPS), UNIQUE KEY `u` (`u`,`p` WITHOUT OVERLAPS) ) ENGINE=DEFAULT_ENGINE DEFAULT CHARSET=latin1 +insert into t values (2, NULL, '2003-03-01', '2003-05-01'); +insert into t values (2, NULL, '2003-03-01', '2003-05-01'); +ERROR 23000: Duplicate entry '2-2003-05-01-2003-03-01' for key 'PRIMARY'
This is wrong. Should be no duplicate key error above.
No, 'tis correct: the table has two unique keys, both WITHOUT OVERLAPS, on
+insert into t values (3, NULL, '2003-03-01', '2003-05-01'); insert into t values (1, 1, '2003-03-01', '2003-05-01'); insert into t values (1, 2, '2003-05-01', '2003-07-01'); -insert into t values (2, 1, '2003-05-01', '2003-07-01'); +insert into t values (4, NULL, '2003-03-01', '2003-05-01'); +create sequence seq start=5; +update t set id= nextval(seq), u= nextval(seq), s='2003-05-01', e='2003-07-01' + where u is NULL; +select * from t; +id u s e +1 1 2003-03-01 2003-05-01 +1 2 2003-05-01 2003-07-01 +5 6 2003-05-01 2003-07-01 +7 8 2003-05-01 2003-07-01 +9 10 2003-05-01 2003-07-01 create or replace table t(id int, s date, e date, period for p(s,e)); insert into t values (1, '2003-01-01', '2003-03-01'), diff --git a/sql/handler.cc b/sql/handler.cc index 917386f4392..16f57533f27 100644 --- a/sql/handler.cc +++ b/sql/handler.cc @@ -7015,7 +7017,8 @@ int handler::ha_check_overlaps(const uchar *old_data, const uchar* new_data) bool key_used= false; for (uint k= 0; k < key_parts && !key_used; k++) key_used= bitmap_is_set(table->write_set, - key_info.key_part[k].fieldnr - 1); + key_info.key_part[k].fieldnr - 1) + && !key_info.key_part[k].field->is_null_in_record(new_data);
Why is that?
if (!key_used) continue; } @@ -7064,8 +7067,15 @@ int handler::ha_check_overlaps(const uchar
*old_data, const uchar* new_data)
error= handler->ha_index_next(record_buffer); }
- if (!error && table->check_period_overlaps(key_info, key_info, - new_data, record_buffer)
== 0)
+ bool null_in_key= false; + for (uint k= 0; k < key_parts && !null_in_key; k++) + { + null_in_key= key_info.key_part[k].field->is_null_in_record(record_buffer); + } + + if (!null_in_key && !error + && table->check_period_overlaps(key_info, key_info, + new_data, record_buffer) == 0)
That's strange. You compare keys in key_period_compare_bases(), why do you do NULL values here?
A record with NULL in key can be returned by ha_index_read_idx_map, or by ha_index_next. It means bases are not equal. I didn't include the code in
On Wed, 11 Mar 2020 at 04:51, Sergei Golubchik <serg@mariadb.org> wrote: the same period. So it is a duplicate by a first (PRIMARY) key. table->check_period_overlaps, since we actually are not ever interested in comparing key bases with NULLs inside. We only care iff key has NULL
error= HA_ERR_FOUND_DUPP_KEY;
if (error == HA_ERR_KEY_NOT_FOUND || error == HA_ERR_END_OF_FILE)
Regards, Sergei VP of MariaDB Server Engineering and security@mariadb.org
-- Yours truly, Nikita Malyavin