10 Sep '21
revision-id: 0984224d3ac33836f126464a46ff744bba3c786a (mariadb-10.6.1-125-g0984224d3ac)
parent(s): 2dccb706369b4e523c8fb2dcef95ac83fbd71e0a
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-10 17:16:43 +0300
message:
Valgrind fixes, poor .result fixes, code cleanups
- Use String::c_ptr_safe() instead of String::c_ptr
- Do proper datatype conversions in Histogram_json_hb::parse
- Remove Histogram_json_hb::Bucket::end_value. Introduce
get_end_value() instead.
---
mysql-test/main/statistics_json.result | 8 ++++----
sql/opt_histogram_json.h | 4 +---
2 files changed, 5 insertions(+), 7 deletions(-)
diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result
index 75ba065f89b..3b701b89a0c 100644
--- a/mysql-test/main/statistics_json.result
+++ b/mysql-test/main/statistics_json.result
@@ -4013,12 +4013,12 @@ test t1_json a a-0 a-9 0.0000 3.0000 1.0000 10 JSON_HB {
}
explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 Using where
+1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 50.00 Using where
Warnings:
Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` between 'a-3a' and 'zzzzzzzzz'
analyze select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 10.00 60.00 Using where
+1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 50.00 60.00 Using where
explain extended select * from t1_json where a < 'b-1a';
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 90.00 Using where
@@ -4053,12 +4053,12 @@ id select_type table type possible_keys key key_len ref rows r_rows filtered r_f
1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 98.02 Using where
explain extended select * from t2 where city = 'Helsinki';
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where
+1 SIMPLE t2 ALL NULL NULL NULL NULL 101 1.98 Using where
Warnings:
Note 1003 select `test`.`t2`.`city` AS `city` from `test`.`t2` where `test`.`t2`.`city` = 'Helsinki'
analyze select * from t2 where city = 'helsinki';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 1.98 Using where
+1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 1.98 1.98 Using where
explain extended select * from t2 where city < 'Lagos';
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where
diff --git a/sql/opt_histogram_json.h b/sql/opt_histogram_json.h
index ed48d951a7f..83f107c13ac 100644
--- a/sql/opt_histogram_json.h
+++ b/sql/opt_histogram_json.h
@@ -61,9 +61,6 @@ class Histogram_json_hb : public Histogram_base
// value is in this bucket.
std::string start_value;
- // The right endpoint. It is non-inclusive, except for the last bucket.
- std::string *end_value;
-
// Cumulative fraction: The fraction of table rows that fall into this
// and preceding buckets.
double cum_fract;
@@ -125,6 +122,7 @@ class Histogram_json_hb : public Histogram_base
private:
double get_left_fract(int idx);
+ std::string& get_end_value(int idx);
int find_bucket(Field *field, const uchar *lookup_val, bool equal_is_less);
};
1
0
revision-id: 2dccb706369b4e523c8fb2dcef95ac83fbd71e0a (mariadb-10.6.1-124-g2dccb706369)
parent(s): e92d464e51f869144d683e19368762e74f5c7e98
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-10 14:59:32 +0300
message:
Fix compile error on windows
---
sql/opt_histogram_json.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc
index 9461bd03dbf..51007044814 100644
--- a/sql/opt_histogram_json.cc
+++ b/sql/opt_histogram_json.cc
@@ -58,7 +58,7 @@ class Histogram_json_builder : public Histogram_builder
ha_rows rows)
: Histogram_builder(col, col_len, rows), histogram(hist)
{
- bucket_capacity= (double)records / histogram->get_width();
+ bucket_capacity= records / histogram->get_width();
hist_width= histogram->get_width();
n_buckets_collected= 0;
bucket.ndv= 0;
1
0
[Commits] e92d464e51f: MDEV-26519: JSON Histograms: improve histogram collection
by psergey 10 Sep '21
by psergey 10 Sep '21
10 Sep '21
revision-id: e92d464e51f869144d683e19368762e74f5c7e98 (mariadb-10.6.1-123-ge92d464e51f)
parent(s): bfdc2ee636901e6f4c86a94e082092e5edc931a1
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-10 10:45:04 +0300
message:
MDEV-26519: JSON Histograms: improve histogram collection
Basic ideas:
1. Store "popular" values in their own buckets.
2. Also store ndv (Number of Distinct Values) in each bucket.
Because of #1, the buckets are now variable-size, so store the size in
each bucket.
Adjust selectivity estimation functions accordingly.
---
mysql-test/main/statistics_json.result | 6538 ++++++++++++++++++++++++++------
sql/opt_histogram_json.cc | 453 ++-
sql/opt_histogram_json.h | 51 +-
3 files changed, 5723 insertions(+), 1319 deletions(-)
diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result
index 102fcfff194..75ba065f89b 100644
--- a/mysql-test/main/statistics_json.result
+++ b/mysql-test/main/statistics_json.result
@@ -232,12 +232,12 @@ nulls_ratio, avg_frequency,
hist_size, hist_type, HEX(histogram)
FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size hist_type HEX(histogram)
-test t1 a 0 49 0.0000 1.0000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2230222C20223131222C20223234222C20223338222C20223439225D0A7D
-test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 6.4000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A202020202276767676767676767676767676222C0A202020202277777777777777777777777777777777777777777777777777777777222C0A20202020227878787878787878787878787878787878787878787878787878222C0A2020202022797979222C0A20202020227A7A7A7A7A7A7A7A7A7A7A7A7A7A7A7A7A7A220A20205D0A7D
-test t1 c aaaa dddddddd 0.1250 7.0000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2261616161222C202261616161222C2022636363636363636363222C20226464646464646464222C20226464646464646464225D0A7D
-test t1 d 1989-03-12 1999-07-23 0.1500 8.5000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A2020202022313938392D30332D3132222C0A2020202022313938392D30332D3132222C0A2020202022313939302D30352D3135222C0A2020202022313939382D30382D3238222C0A2020202022313939392D30372D3233220A20205D0A7D
-test t1 e 0.01 0.112 0.2250 6.2000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B22302E3031222C2022302E3031222C2022302E3035222C2022302E31222C2022302E313132225D0A7D
-test t1 f 1 5 0.2000 6.4000 4 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2201222C202202222C202203222C202204222C202205225D0A7D
+test t1 a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
+test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz 0.2000 6.4000 4 JSON_HB 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
+test t1 c aaaa dddddddd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
+test t1 d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
+test t1 e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
+test t1 f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
DELETE FROM mysql.column_stats;
set histogram_size=8;
set histogram_type=@DOUBLE_PREC_TYPE;
@@ -251,12 +251,12 @@ nulls_ratio, avg_frequency,
hist_size, hist_type, HEX(histogram)
FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size hist_type HEX(histogram)
-test t1 a 0 49 0.0000 1.0000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2230222C202235222C20223131222C20223138222C20223234222C20223332222C20223338222C20223433222C20223439225D0A7D
-test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz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
-test t1 c aaaa dddddddd 0.1250 7.0000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A202020202261616161222C0A202020202261616161222C0A202020202261616161222C0A2020202022626262626262222C0A2020202022636363636363636363222C0A2020202022636363636363636363222C0A20202020226464646464646464222C0A20202020226464646464646464222C0A20202020226464646464646464220A20205D0A7D
-test t1 d 1989-03-12 1999-07-23 0.1500 8.5000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A2020202022313938392D30332D3132222C0A2020202022313938392D30332D3132222C0A2020202022313938392D30332D3132222C0A2020202022313939302D30352D3135222C0A2020202022313939302D30352D3135222C0A2020202022313939302D30352D3135222C0A2020202022313939382D30382D3238222C0A2020202022313939392D30372D3233222C0A2020202022313939392D30372D3233220A20205D0A7D
-test t1 e 0.01 0.112 0.2250 6.2000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B0A2020202022302E3031222C0A2020202022302E3031222C0A2020202022302E3031222C0A2020202022302E3031222C0A2020202022302E3035222C0A2020202022302E31222C0A2020202022302E31222C0A2020202022302E313132222C0A2020202022302E313132220A20205D0A7D
-test t1 f 1 5 0.2000 6.4000 8 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2201222C202202222C202202222C202203222C202203222C202204222C202204222C202205222C202205225D0A7D
+test t1 a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
7A65223A20302E3132352C0A202020202020226E6476223A20350A202020207D2C0A202020207B0A202020202020227374617274223A20223433222C0A20202020202022656E64223A20223439222C0A2020202020202273697A65223A20302E3132352C0A202020202020226E6476223A20350A202020207D0A20205D0A7D
+test t1 b vvvvvvvvvvvvv zzzzzzzzzzzzzzzzzz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
3837352C0A202020202020226E6476223A20310A202020207D0A20205D0A7D
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decode_histogram(hist_type,histogram) {
- "histogram_hb_v1": [
- "0.0",
- "0.0",
- "0.0",
- "0.0",
- "0.0",
- "0.0",
- "0.0",
- "0.1",
- "0.1",
- "0.2",
- "0.2",
- "0.3",
- "0.3",
- "0.4",
- "0.4",
- "0.4",
- "0.5",
- "0.5",
- "0.6",
- "0.6",
- "0.7",
- "0.8",
- "0.9",
- "1.0",
- "1.1",
- "1.3",
- "1.3",
- "1.4",
- "1.5",
- "1.6",
- "1.7",
- "1.8",
- "1.9",
- "2.0",
- "2.2",
- "2.3",
- "2.4",
- "2.5",
- "2.7",
- "2.8",
- "3.0",
- "3.2",
- "3.3",
- "3.5",
- "3.7",
- "3.8",
- "4.1",
- "4.3",
- "4.7",
- "4.9",
- "5.3",
- "5.5",
- "5.7",
- "5.9",
- "6.4",
- "6.7",
- "7.0",
- "7.4",
- "7.6",
- "7.8",
- "8.2",
- "8.7",
- "9.0",
- "9.3",
- "9.7",
- "10.5",
- "11.0",
- "11.8",
- "12.4",
- "13.2",
- "14.0",
- "15.8",
- "16.5",
- "18.0",
- "19.7",
- "21.2",
- "23.2",
- "27.8",
- "31.0",
- "32.9",
- "36.4",
- "41.6",
- "45.7",
- "50.2",
- "52.6",
- "60.3",
- "65.3",
- "72.1",
- "76.7",
- "81.2",
- "85.6",
- "87.6",
- "89.7",
- "92.1",
- "94.1",
- "95.8",
- "97.2",
- "98.1",
- "99.0",
- "99.9",
- "99.9"
+ "histogram_hb_v2": [
+ {
+ "start": "0.0",
+ "size": 0.066056911,
+ "ndv": 1
+ },
+ {
+ "start": "0.1",
+ "size": 0.020325203,
+ "ndv": 1
+ },
+ {
+ "start": "0.2",
+ "size": 0.022357724,
+ "ndv": 1
+ },
+ {
+ "start": "0.3",
+ "size": 0.017276423,
+ "ndv": 1
+ },
+ {
+ "start": "0.4",
+ "size": 0.025406504,
+ "ndv": 1
+ },
+ {
+ "start": "0.5",
+ "size": 0.020325203,
+ "ndv": 1
+ },
+ {
+ "start": "0.6",
+ "size": 0.020325203,
+ "ndv": 1
+ },
+ {
+ "start": "0.7",
+ "size": 0.017276423,
+ "ndv": 1
+ },
+ {
+ "start": "0.8",
+ "size": 0.010162602,
+ "ndv": 1
+ },
+ {
+ "start": "0.9",
+ "size": 0.010162602,
+ "ndv": 1
+ },
+ {
+ "start": "1.0",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "1.1",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "1.2",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "1.3",
+ "size": 0.005081301,
+ "ndv": 1
+ },
+ {
+ "start": "1.4",
+ "size": 0.015243902,
+ "ndv": 1
+ },
+ {
+ "start": "1.5",
+ "size": 0.005081301,
+ "ndv": 1
+ },
+ {
+ "start": "1.6",
+ "size": 0.015243902,
+ "ndv": 1
+ },
+ {
+ "start": "1.7",
+ "size": 0.010162602,
+ "ndv": 1
+ },
+ {
+ "start": "1.8",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "1.9",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "2.0",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "2.2",
+ "size": 0.011178862,
+ "ndv": 1
+ },
+ {
+ "start": "2.3",
+ "size": 0.010162602,
+ "ndv": 1
+ },
+ {
+ "start": "2.4",
+ "size": 0.009146341,
+ "ndv": 1
+ },
+ {
+ "start": "2.5",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "2.6",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "2.7",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "2.9",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "3.1",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "3.2",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "3.3",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "3.5",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "3.7",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "3.8",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "4.1",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "4.3",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "4.6",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "4.8",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "5.0",
+ "size": 0.009146341,
+ "ndv": 5
+ },
+ {
+ "start": "5.4",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "5.6",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "5.7",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "6.0",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "6.4",
+ "size": 0.009146341,
+ "ndv": 2
+ },
+ {
+ "start": "6.6",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "6.9",
+ "size": 0.009146341,
+ "ndv": 5
+ },
+ {
+ "start": "7.3",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "7.5",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "7.8",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "8.1",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "8.5",
+ "size": 0.009146341,
+ "ndv": 3
+ },
+ {
+ "start": "8.7",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "9.0",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "9.4",
+ "size": 0.009146341,
+ "ndv": 4
+ },
+ {
+ "start": "9.7",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "10.5",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "11.0",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "11.6",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "12.3",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "12.9",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "13.8",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "14.6",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "16.1",
+ "size": 0.009146341,
+ "ndv": 5
+ },
+ {
+ "start": "16.8",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "18.1",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "19.7",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "21.2",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "23.2",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "27.7",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "30.0",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "32.3",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "34.8",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "39.8",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "43.7",
+ "size": 0.009146341,
+ "ndv": 9
+ },
+ {
+ "start": "47.5",
+ "size": 0.009146341,
+ "ndv": 9
+ },
+ {
+ "start": "50.8",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "55.1",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "60.4",
+ "size": 0.009146341,
+ "ndv": 8
+ },
+ {
+ "start": "65.3",
+ "size": 0.009146341,
+ "ndv": 9
+ },
+ {
+ "start": "71.7",
+ "size": 0.009146341,
+ "ndv": 9
+ },
+ {
+ "start": "76.7",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "80.0",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "84.8",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "86.6",
+ "size": 0.009146341,
+ "ndv": 9
+ },
+ {
+ "start": "88.9",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "90.7",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "93.0",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "95.0",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "95.9",
+ "size": 0.009146341,
+ "ndv": 7
+ },
+ {
+ "start": "97.3",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "98.1",
+ "size": 0.009146341,
+ "ndv": 6
+ },
+ {
+ "start": "99.0",
+ "size": 0.006097561,
+ "ndv": 4
+ },
+ {
+ "start": "99.9",
+ "end": "99.9",
+ "size": 0.015243902,
+ "ndv": 1
+ }
]
}
select UPPER(db_name),UPPER(table_name),UPPER(column_name),min_value,max_value,nulls_ratio,avg_length,avg_frequency,hist_size,hist_type,hex(histogram),decode_histogram(hist_type,histogram) from mysql.column_stats where UPPER(db_name)='WORLD' and UPPER(table_name)='CITY' and UPPER(column_name) = 'POPULATION';;
@@ -1617,266 +1982,1287 @@ max_value 10500000
nulls_ratio 0.0000
avg_length 4.0000
avg_frequency 1.0467
-hist_size 254
+hist_size 255
hist_type JSON_HB
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set histogram_type=@SINGLE_PREC_TYPE;
@@ -1949,7 +3335,7 @@ nulls_ratio, avg_frequency,
hist_size, hist_type, HEX(histogram)
FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size hist_type HEX(histogram)
-test t1 a 1 3 0.0000 1.0000 10 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2231222C202231222C202231222C202231222C202232222C202232222C202232222C202233222C202233222C202233222C202233225D0A7D
+test t1 a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
set histogram_size=default;
drop table t1;
#
@@ -1974,7 +3360,7 @@ nulls_ratio, avg_frequency,
hist_size, hist_type, HEX(histogram)
FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size hist_type HEX(histogram)
-test t1 a 1 5 0.0000 1.0000 10 JSON_HB 7B0A202022686973746F6772616D5F68625F7631223A205B2231222C202231222C202232222C202232222C202233222C202233222C202234222C202234222C202235222C202235222C202235225D0A7D
+test t1 a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
set histogram_size=0;
set histogram_type=@SINGLE_PREC_TYPE;
drop table t1;
@@ -2015,7 +3401,7 @@ nulls_ratio, avg_frequency,
hist_size, hist_type, HEX(histogram)
FROM mysql.column_stats;
db_name table_name column_name min_value max_value nulls_ratio avg_frequency hist_size hist_type HEX(histogram)
-test t2 id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020202022656E64223A202231303234222C0A2020202020202273697A65223A20322E343431343036652D342C0A202020202020226E6476223A20310A202020207D0A20205D0A7D
set histogram_size=0;
drop table t1, t2;
set use_stat_tables=@save_use_stat_tables;
@@ -2176,18 +3562,63 @@ DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram)
t1 id 1 17384 0.0000 4.0000 14.0000 {
- "histogram_hb_v1": [
- "1",
- "1639",
- "3277",
- "4916",
- "6554",
- "9193",
- "10831",
- "12469",
- "14108",
- "15746",
- "17384"
+ "histogram_hb_v2": [
+ {
+ "start": "1",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "1639",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "3277",
+ "size": 0.099997384,
+ "ndv": 1640
+ },
+ {
+ "start": "4916",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "6554",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "8192",
+ "size": 0.099997384,
+ "ndv": 1640
+ },
+ {
+ "start": "10831",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "12469",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "14107",
+ "size": 0.099997384,
+ "ndv": 1640
+ },
+ {
+ "start": "15746",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "17384",
+ "end": "17384",
+ "size": 2.615792e-5,
+ "ndv": 1
+ }
]
}
set analyze_sample_percentage=0.1;
@@ -2203,18 +3634,63 @@ DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram)
t1 id 111 17026 0.0000 4.0000 10.4739 {
- "histogram_hb_v1": [
- "111",
- "988",
- "2490",
- "4088",
- "5743",
- "7806",
- "10217",
- "12072",
- "14178",
- "15144",
- "17026"
+ "histogram_hb_v2": [
+ {
+ "start": "111",
+ "size": 0.099056604,
+ "ndv": 20
+ },
+ {
+ "start": "988",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "2490",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "4088",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "5743",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "7772",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "10164",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "12022",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "14092",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "15122",
+ "size": 0.099056604,
+ "ndv": 21
+ },
+ {
+ "start": "16975",
+ "end": "17026",
+ "size": 0.009433962,
+ "ndv": 2
+ }
]
}
#
@@ -2230,18 +3706,63 @@ DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram)
t1 id 1 17384 0.0000 4.0000 14.0401 {
- "histogram_hb_v1": [
- "1",
- "1623",
- "3252",
- "4868",
- "6483",
- "8151",
- "10789",
- "12433",
- "14077",
- "15724",
- "17384"
+ "histogram_hb_v2": [
+ {
+ "start": "1",
+ "size": 0.09999826,
+ "ndv": 1591
+ },
+ {
+ "start": "1623",
+ "size": 0.09999826,
+ "ndv": 1600
+ },
+ {
+ "start": "3252",
+ "size": 0.09999826,
+ "ndv": 1587
+ },
+ {
+ "start": "4868",
+ "size": 0.09999826,
+ "ndv": 1593
+ },
+ {
+ "start": "6483",
+ "size": 0.09999826,
+ "ndv": 1630
+ },
+ {
+ "start": "8151",
+ "size": 0.09999826,
+ "ndv": 1608
+ },
+ {
+ "start": "10789",
+ "size": 0.09999826,
+ "ndv": 1619
+ },
+ {
+ "start": "12433",
+ "size": 0.09999826,
+ "ndv": 1627
+ },
+ {
+ "start": "14077",
+ "size": 0.09999826,
+ "ndv": 1614
+ },
+ {
+ "start": "15724",
+ "size": 0.09999826,
+ "ndv": 1624
+ },
+ {
+ "start": "17384",
+ "end": "17384",
+ "size": 1.739705e-5,
+ "ndv": 1
+ }
]
}
set analyze_sample_percentage=0;
@@ -2257,18 +3778,63 @@ DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram)
t1 id 1 17384 0.0000 4.0000 13.9812 {
- "histogram_hb_v1": [
- "1",
- "1651",
- "3306",
- "4948",
- "6596",
- "9239",
- "10863",
- "12495",
- "14113",
- "15757",
- "17384"
+ "histogram_hb_v2": [
+ {
+ "start": "1",
+ "size": 0.099999181,
+ "ndv": 1651
+ },
+ {
+ "start": "1651",
+ "size": 0.099999181,
+ "ndv": 1656
+ },
+ {
+ "start": "3306",
+ "size": 0.099999181,
+ "ndv": 1642
+ },
+ {
+ "start": "4948",
+ "size": 0.099999181,
+ "ndv": 1649
+ },
+ {
+ "start": "6596",
+ "size": 0.099999181,
+ "ndv": 1644
+ },
+ {
+ "start": "9239",
+ "size": 0.099999181,
+ "ndv": 1625
+ },
+ {
+ "start": "10863",
+ "size": 0.099999181,
+ "ndv": 1633
+ },
+ {
+ "start": "12495",
+ "size": 0.099999181,
+ "ndv": 1619
+ },
+ {
+ "start": "14113",
+ "size": 0.099999181,
+ "ndv": 1645
+ },
+ {
+ "start": "15757",
+ "size": 0.099999181,
+ "ndv": 1628
+ },
+ {
+ "start": "17384",
+ "end": "17384",
+ "size": 8.190612e-6,
+ "ndv": 1
+ }
]
}
#
@@ -2290,18 +3856,63 @@ DECODE_HISTOGRAM(hist_type, histogram)
from mysql.column_stats;
table_name column_name min_value max_value nulls_ratio avg_length avg_frequency DECODE_HISTOGRAM(hist_type, histogram)
t1 id 1 17384 0.0000 4.0000 14.0000 {
- "histogram_hb_v1": [
- "1",
- "1639",
- "3277",
- "4916",
- "6554",
- "9193",
- "10831",
- "12469",
- "14108",
- "15746",
- "17384"
+ "histogram_hb_v2": [
+ {
+ "start": "1",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "1639",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "3277",
+ "size": 0.099997384,
+ "ndv": 1640
+ },
+ {
+ "start": "4916",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "6554",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "8192",
+ "size": 0.099997384,
+ "ndv": 1640
+ },
+ {
+ "start": "10831",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "12469",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "14107",
+ "size": 0.099997384,
+ "ndv": 1640
+ },
+ {
+ "start": "15746",
+ "size": 0.099997384,
+ "ndv": 1639
+ },
+ {
+ "start": "17384",
+ "end": "17384",
+ "size": 2.615792e-5,
+ "ndv": 1
+ }
]
}
explain select * from t1;
@@ -2345,122 +3956,72 @@ test.t1_json analyze status Engine-independent statistics collected
test.t1_json analyze status OK
select * from mysql.column_stats where table_name='t1_json';
db_name table_name column_name min_value max_value nulls_ratio avg_length avg_frequency hist_size hist_type histogram
-test t1_json a a-0 a-9 0.0000 3.0000 1.0000 100 JSON_HB {
- "histogram_hb_v1": [
- "a-0",
- "a-0",
- "a-0",
- "a-0",
- "a-0",
- "a-0",
- "a-0",
- "a-0",
- "a-0",
- "a-0",
- "a-1",
- "a-1",
- "a-1",
- "a-1",
- "a-1",
- "a-1",
- "a-1",
- "a-1",
- "a-1",
- "a-1",
- "a-2",
- "a-2",
- "a-2",
- "a-2",
- "a-2",
- "a-2",
- "a-2",
- "a-2",
- "a-2",
- "a-2",
- "a-3",
- "a-3",
- "a-3",
- "a-3",
- "a-3",
- "a-3",
- "a-3",
- "a-3",
- "a-3",
- "a-3",
- "a-4",
- "a-4",
- "a-4",
- "a-4",
- "a-4",
- "a-4",
- "a-4",
- "a-4",
- "a-4",
- "a-4",
- "a-5",
- "a-5",
- "a-5",
- "a-5",
- "a-5",
- "a-5",
- "a-5",
- "a-5",
- "a-5",
- "a-5",
- "a-6",
- "a-6",
- "a-6",
- "a-6",
- "a-6",
- "a-6",
- "a-6",
- "a-6",
- "a-6",
- "a-6",
- "a-7",
- "a-7",
- "a-7",
- "a-7",
- "a-7",
- "a-7",
- "a-7",
- "a-7",
- "a-7",
- "a-7",
- "a-8",
- "a-8",
- "a-8",
- "a-8",
- "a-8",
- "a-8",
- "a-8",
- "a-8",
- "a-8",
- "a-8",
- "a-9",
- "a-9",
- "a-9",
- "a-9",
- "a-9",
- "a-9",
- "a-9",
- "a-9",
- "a-9",
- "a-9",
- "a-9"
+test t1_json a a-0 a-9 0.0000 3.0000 1.0000 10 JSON_HB {
+ "histogram_hb_v2": [
+ {
+ "start": "a-0",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-1",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-2",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-3",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-4",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-5",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-6",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-7",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-8",
+ "size": 0.1,
+ "ndv": 1
+ },
+ {
+ "start": "a-9",
+ "end": "a-9",
+ "size": 0.1,
+ "ndv": 1
+ }
]
}
explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 59.41 Using where
+1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 Using where
Warnings:
Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` between 'a-3a' and 'zzzzzzzzz'
analyze select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 59.41 60.00 Using where
+1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 10.00 60.00 Using where
explain extended select * from t1_json where a < 'b-1a';
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 99.01 Using where
+1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 90.00 Using where
Warnings:
Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` < 'b-1a'
analyze select * from t1_json where a > 'zzzzzzzzz';
@@ -2470,7 +4031,7 @@ drop table ten;
UPDATE mysql.column_stats SET histogram='["a-1", "a-2", {"a": "b"}, "a-3"]' WHERE table_name='t1_json';
FLUSH TABLES;
explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
-ERROR HY000: Failed to parse histogram: Root JSON element must be a JSON object at offset 1.
+ERROR HY000: Failed to parse histogram: Root JSON element must be a JSON object at offset 12345.
create table t2 (
city varchar(100)
);
@@ -2484,20 +4045,20 @@ test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK
explain extended select * from t2 where city = 'Moscow';
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE t2 ALL NULL NULL NULL NULL 101 98.04 Using where
+1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`city` AS `city` from `test`.`t2` where `test`.`t2`.`city` = 'Moscow'
analyze select * from t2 where city = 'Moscow';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 98.04 98.02 Using where
+1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 98.02 Using where
explain extended select * from t2 where city = 'Helsinki';
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE t2 ALL NULL NULL NULL NULL 101 2.00 Using where
+1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where
Warnings:
Note 1003 select `test`.`t2`.`city` AS `city` from `test`.`t2` where `test`.`t2`.`city` = 'Helsinki'
analyze select * from t2 where city = 'helsinki';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 2.00 1.98 Using where
+1 SIMPLE t2 ALL NULL NULL NULL NULL 101 101.00 50.00 1.98 Using where
explain extended select * from t2 where city < 'Lagos';
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 101 50.00 Using where
@@ -2514,672 +4075,3277 @@ set histogram_size=50;
ANALYZE TABLE Country, City, CountryLanguage persistent for all;
SELECT column_name, min_value, max_value, hist_size, hist_type, histogram FROM mysql.column_stats;
column_name min_value max_value hist_size hist_type histogram
-Code ABW ZWE 50 JSON_HB {
- "histogram_hb_v1": [
- "ABW",
- "ALB",
- "ARM",
- "AUS",
- "BEN",
- "BHR",
- "BMU",
- "BTN",
- "CCK",
- "CMR",
- "COL",
- "CXR",
- "DJI",
- "ECU",
- "ESP",
- "FLK",
- "GBR",
- "GLP",
- "GRD",
- "GUM",
- "HRV",
- "IOT",
- "ISR",
- "JPN",
- "KIR",
- "LBN",
- "LKA",
- "MAC",
- "MDG",
- "MLI",
- "MOZ",
- "MWI",
- "NCL",
- "NIU",
- "NZL",
- "PER",
- "PRI",
- "PSE",
- "RUS",
- "SGP",
- "SLE",
- "SPM",
- "SWE",
- "TCD",
- "TKM",
- "TUR",
- "UGA",
- "UZB",
- "VIR",
- "YEM",
- "ZWE"
+Code ABW ZWE 60 JSON_HB {
+ "histogram_hb_v2": [
+ {
+ "start": "ABW",
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}
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- "BLR",
- "BRA",
- "BRA",
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- "USA",
- "USA",
- "USA",
- "USA",
- "VNM",
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+Name A Coruña (La Coruña) Ürgenc 51 JSON_HB {
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+ {
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+ {
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+ "end": "Ãœrgenc",
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+ }
]
}
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- "977856",
- "1266461",
- "2130359",
- "10500000"
+Population 42 10500000 51 JSON_HB {
+ "histogram_hb_v2": [
+ {
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+ "size": 0.019857808,
+ "ndv": 79
+ },
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]
}
-Country ABW ZWE 50 JSON_HB {
- "histogram_hb_v1": [
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- "ALB",
- "ATG",
- "AZE",
- "BFA",
- "BIH",
- "BRB",
- "CAN",
- "CHL",
- "CMR",
- "COG",
- "CRI",
- "DEU",
- "ECU",
- "ETH",
- "FRO",
- "GEO",
- "GMB",
- "GTM",
- "HND",
- "IDN",
- "IRN",
- "ITA",
- "KAZ",
- "KHM",
- "LBR",
- "LTU",
- "MAR",
- "MHL",
- "MMR",
- "MOZ",
- "MUS",
- "NAM",
- "NGA",
- "NPL",
- "PAK",
- "PHL",
- "PRY",
- "RUS",
- "SDN",
- "SLE",
- "SVK",
- "TCA",
- "THA",
- "TUN",
- "TZA",
- "UKR",
- "UZB",
- "VNM",
- "ZAF",
- "ZWE"
+Country ABW ZWE 52 JSON_HB {
+ "histogram_hb_v2": [
+ {
+ "start": "ABW",
+ "size": 0.019308943,
+ "ndv": 4
+ },
+ {
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+ "ndv": 7
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+ },
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+ "ndv": 8
+ },
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+ "ndv": 6
+ },
+ {
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+ "size": 0.019308943,
+ "ndv": 4
+ },
+ {
+ "start": "CHE",
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+ "ndv": 3
+ },
+ {
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+ },
+ {
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+ "ndv": 5
+ },
+ {
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+ "ndv": 8
+ },
+ {
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+ "ndv": 5
+ },
+ {
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+ {
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+ "ndv": 5
+ },
+ {
+ "start": "MUS",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "NAM",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "NGA",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "NOR",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "PAK",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "PHL",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "PRK",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "ROM",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "RWA",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "SGP",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "SOM",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "SWE",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "TGO",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "TKM",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "TWN",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "UGA",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "USA",
+ "size": 0.019308943,
+ "ndv": 4
+ },
+ {
+ "start": "VEN",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "WLF",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "ZAF",
+ "end": "ZWE",
+ "size": 0.015243902,
+ "ndv": 3
+ }
]
}
-Language Abhyasi [South]Mande 50 JSON_HB {
- "histogram_hb_v1": [
- "Abhyasi",
- "Amhara",
- "Arabic",
- "Arawakan",
- "Balante",
- "Belorussian",
- "Bulgariana",
- "Chakma",
- "Chinese",
- "Comorian-madagassi",
- "Creole French",
- "Dinka",
- "English",
- "English",
- "English",
- "Ewe",
- "French",
- "Ful",
- "Garifuna",
- "German",
- "Gujarati",
- "Herero",
- "Hungarian",
- "Italian",
- "Kanuri",
- "Khoekhoe",
- "Kosrean",
- "Lithuanian",
- "Macedonian",
- "Malay-English",
- "Maori",
- "Meru",
- "Mossi",
- "Norwegian",
- "Ouaddai",
- "Pilipino",
- "Portuguese",
- "Romani",
- "Russian",
- "San",
- "Shambala",
- "Somali",
- "Spanish",
- "Spanish",
- "Tagalog",
- "Teso",
- "Tswa",
- "Turkmenian",
- "Ukrainian and Russian",
- "Wolea",
- "[South]Mande"
+Language Abhyasi [South]Mande 51 JSON_HB {
+ "histogram_hb_v2": [
+ {
+ "start": "Abhyasi",
+ "size": 0.019308943,
+ "ndv": 11
+ },
+ {
+ "start": "Amhara",
+ "size": 0.019308943,
+ "ndv": 4
+ },
+ {
+ "start": "Arabic",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "Araucan",
+ "size": 0.019308943,
+ "ndv": 9
+ },
+ {
+ "start": "Bajan",
+ "size": 0.019308943,
+ "ndv": 16
+ },
+ {
+ "start": "Belorussian",
+ "size": 0.019308943,
+ "ndv": 9
+ },
+ {
+ "start": "Brahui",
+ "size": 0.019308943,
+ "ndv": 14
+ },
+ {
+ "start": "Catalan",
+ "size": 0.019308943,
+ "ndv": 12
+ },
+ {
+ "start": "Chinese",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "Circassian",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "Creole English",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "Danish",
+ "size": 0.019308943,
+ "ndv": 11
+ },
+ {
+ "start": "Dyula",
+ "size": 0.004065041,
+ "ndv": 4
+ },
+ {
+ "start": "English",
+ "size": 0.06097561,
+ "ndv": 1
+ },
+ {
+ "start": "Eskimo Languages",
+ "size": 0.014227642,
+ "ndv": 8
+ },
+ {
+ "start": "French",
+ "size": 0.025406504,
+ "ndv": 1
+ },
+ {
+ "start": "Fries",
+ "size": 0.019308943,
+ "ndv": 8
+ },
+ {
+ "start": "Gagauzi",
+ "size": 0.019308943,
+ "ndv": 8
+ },
+ {
+ "start": "German",
+ "size": 0.019308943,
+ "ndv": 9
+ },
+ {
+ "start": "Greek",
+ "size": 0.019308943,
+ "ndv": 15
+ },
+ {
+ "start": "Hausa",
+ "size": 0.019308943,
+ "ndv": 10
+ },
+ {
+ "start": "Hungarian",
+ "size": 0.019308943,
+ "ndv": 10
+ },
+ {
+ "start": "Italian",
+ "size": 0.019308943,
+ "ndv": 4
+ },
+ {
+ "start": "Joruba",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "Kazakh",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "Kongo",
+ "size": 0.019308943,
+ "ndv": 9
+ },
+ {
+ "start": "Kurdish",
+ "size": 0.019308943,
+ "ndv": 15
+ },
+ {
+ "start": "Luchazi",
+ "size": 0.019308943,
+ "ndv": 16
+ },
+ {
+ "start": "Makua",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "Malinke",
+ "size": 0.019308943,
+ "ndv": 15
+ },
+ {
+ "start": "Marma",
+ "size": 0.019308943,
+ "ndv": 17
+ },
+ {
+ "start": "Miskito",
+ "size": 0.019308943,
+ "ndv": 17
+ },
+ {
+ "start": "Naudemba",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "Nubian Languages",
+ "size": 0.019308943,
+ "ndv": 17
+ },
+ {
+ "start": "Palau",
+ "size": 0.019308943,
+ "ndv": 12
+ },
+ {
+ "start": "Polish",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "Portuguese",
+ "size": 0.019308943,
+ "ndv": 9
+ },
+ {
+ "start": "Romani",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "Russian",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "Sango",
+ "size": 0.019308943,
+ "ndv": 10
+ },
+ {
+ "start": "Shambala",
+ "size": 0.019308943,
+ "ndv": 11
+ },
+ {
+ "start": "Somali",
+ "size": 0.015243902,
+ "ndv": 9
+ },
+ {
+ "start": "Spanish",
+ "size": 0.028455285,
+ "ndv": 1
+ },
+ {
+ "start": "Sranantonga",
+ "size": 0.019308943,
+ "ndv": 11
+ },
+ {
+ "start": "Tamashek",
+ "size": 0.019308943,
+ "ndv": 9
+ },
+ {
+ "start": "Thai",
+ "size": 0.019308943,
+ "ndv": 14
+ },
+ {
+ "start": "Tswana",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "Turkmenian",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "Ukrainian and Russian",
+ "size": 0.019308943,
+ "ndv": 9
+ },
+ {
+ "start": "Watyi",
+ "size": 0.019308943,
+ "ndv": 14
+ },
+ {
+ "start": "Zulu",
+ "end": "[South]Mande",
+ "size": 0.00203252,
+ "ndv": 2
+ }
]
}
-Percentage 0.0 99.9 50 JSON_HB {
- "histogram_hb_v1": [
- "0.0",
- "0.0",
- "0.0",
- "0.0",
- "0.1",
- "0.2",
- "0.3",
- "0.4",
- "0.5",
- "0.6",
- "0.7",
- "0.9",
- "1.1",
- "1.3",
- "1.5",
- "1.7",
- "1.9",
- "2.2",
- "2.4",
- "2.7",
- "3.0",
- "3.3",
- "3.7",
- "4.1",
- "4.7",
- "5.3",
- "5.7",
- "6.4",
- "7.0",
- "7.6",
- "8.2",
- "9.0",
- "9.7",
- "11.0",
- "12.4",
- "14.0",
- "16.5",
- "19.7",
- "23.2",
- "31.0",
- "36.4",
- "45.7",
- "52.6",
- "65.3",
- "76.7",
- "85.6",
- "89.7",
- "94.1",
- "97.2",
- "99.0",
- "99.9"
+Percentage 0.0 99.9 49 JSON_HB {
+ "histogram_hb_v2": [
+ {
+ "start": "0.0",
+ "size": 0.066056911,
+ "ndv": 1
+ },
+ {
+ "start": "0.1",
+ "size": 0.020325203,
+ "ndv": 1
+ },
+ {
+ "start": "0.2",
+ "size": 0.022357724,
+ "ndv": 1
+ },
+ {
+ "start": "0.3",
+ "size": 0.017276423,
+ "ndv": 1
+ },
+ {
+ "start": "0.4",
+ "size": 0.025406504,
+ "ndv": 1
+ },
+ {
+ "start": "0.5",
+ "size": 0.020325203,
+ "ndv": 1
+ },
+ {
+ "start": "0.6",
+ "size": 0.020325203,
+ "ndv": 1
+ },
+ {
+ "start": "0.7",
+ "size": 0.019308943,
+ "ndv": 2
+ },
+ {
+ "start": "0.8",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "1.0",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "1.3",
+ "size": 0.019308943,
+ "ndv": 2
+ },
+ {
+ "start": "1.4",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "1.6",
+ "size": 0.019308943,
+ "ndv": 2
+ },
+ {
+ "start": "1.8",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "2.0",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "2.3",
+ "size": 0.019308943,
+ "ndv": 2
+ },
+ {
+ "start": "2.5",
+ "size": 0.019308943,
+ "ndv": 3
+ },
+ {
+ "start": "2.8",
+ "size": 0.019308943,
+ "ndv": 4
+ },
+ {
+ "start": "3.1",
+ "size": 0.019308943,
+ "ndv": 4
+ },
+ {
+ "start": "3.4",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "3.8",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "4.2",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "4.8",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "5.3",
+ "size": 0.019308943,
+ "ndv": 5
+ },
+ {
+ "start": "5.7",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "6.4",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "7.0",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "7.6",
+ "size": 0.019308943,
+ "ndv": 6
+ },
+ {
+ "start": "8.1",
+ "size": 0.019308943,
+ "ndv": 7
+ },
+ {
+ "start": "8.9",
+ "size": 0.019308943,
+ "ndv": 8
+ },
+ {
+ "start": "9.6",
+ "size": 0.019308943,
+ "ndv": 10
+ },
+ {
+ "start": "10.9",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "12.1",
+ "size": 0.019308943,
+ "ndv": 14
+ },
+ {
+ "start": "13.8",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "16.1",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "18.4",
+ "size": 0.019308943,
+ "ndv": 14
+ },
+ {
+ "start": "21.6",
+ "size": 0.019308943,
+ "ndv": 14
+ },
+ {
+ "start": "28.3",
+ "size": 0.019308943,
+ "ndv": 16
+ },
+ {
+ "start": "33.0",
+ "size": 0.019308943,
+ "ndv": 16
+ },
+ {
+ "start": "41.6",
+ "size": 0.019308943,
+ "ndv": 18
+ },
+ {
+ "start": "50.2",
+ "size": 0.019308943,
+ "ndv": 16
+ },
+ {
+ "start": "59.7",
+ "size": 0.019308943,
+ "ndv": 18
+ },
+ {
+ "start": "70.6",
+ "size": 0.019308943,
+ "ndv": 16
+ },
+ {
+ "start": "80.0",
+ "size": 0.019308943,
+ "ndv": 14
+ },
+ {
+ "start": "86.8",
+ "size": 0.019308943,
+ "ndv": 17
+ },
+ {
+ "start": "91.3",
+ "size": 0.019308943,
+ "ndv": 15
+ },
+ {
+ "start": "95.6",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "97.6",
+ "size": 0.019308943,
+ "ndv": 13
+ },
+ {
+ "start": "99.6",
+ "end": "99.9",
+ "size": 0.016260163,
+ "ndv": 2
+ }
]
}
analyze select * from Country use index () where Code between 'BBC' and 'GGG';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 25.49 25.52 Using where
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 25.10 25.52 Using where
analyze select * from Country use index () where Code < 'BBC';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 7.84 7.11 Using where
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 8.37 7.11 Using where
set histogram_type=@save_histogram_type;
set histogram_size=@save_histogram_size;
DROP SCHEMA world;
diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc
index f1030662572..9461bd03dbf 100644
--- a/sql/opt_histogram_json.cc
+++ b/sql/opt_histogram_json.cc
@@ -23,12 +23,35 @@
class Histogram_json_builder : public Histogram_builder
{
Histogram_json_hb *histogram;
- uint hist_width; /* the number of points in the histogram */
- double bucket_capacity; /* number of rows in a bucket of the histogram */
- uint curr_bucket; /* number of the current bucket to be built */
+ /* Number of buckets in the histogram */
+ uint hist_width;
- std::vector<std::string> bucket_bounds;
- bool first_value= true;
+ /*
+ Number of rows that we intend to have in the bucket. That is, this is
+
+ n_rows_in_table / histo_width
+
+ Actual number of rows in the buckets we produce may vary because of
+ "popular values" and rounding.
+ */
+ longlong bucket_capacity;
+
+ /* Number of the buckets already collected */
+ uint n_buckets_collected;
+
+ /* Data about the bucket we are filling now */
+ struct CurBucket
+ {
+ /* Number of values in the bucket so far. */
+ longlong size;
+
+ /* Number of distinct values in the bucket */
+ int ndv;
+ };
+ CurBucket bucket;
+
+ /* Used to create the JSON representation of the histogram. */
+ Json_writer writer;
public:
Histogram_json_builder(Histogram_json_hb *hist, Field *col, uint col_len,
@@ -37,57 +60,159 @@ class Histogram_json_builder : public Histogram_builder
{
bucket_capacity= (double)records / histogram->get_width();
hist_width= histogram->get_width();
- curr_bucket= 0;
+ n_buckets_collected= 0;
+ bucket.ndv= 0;
+ bucket.size= 0;
+
+ writer.start_object();
+ writer.add_member(Histogram_json_hb::JSON_NAME).start_array();
}
~Histogram_json_builder() override = default;
+ bool bucket_is_empty() { return bucket.ndv == 0; }
+
+ /*
+ Flush the current bucket out (to JSON output), and set it to be empty.
+ */
+ void finalize_bucket()
+ {
+ double fract= (double) bucket.size / records;
+ writer.add_member("size").add_double(fract);
+ writer.add_member("ndv").add_ll(bucket.ndv);
+ writer.end_object();
+ n_buckets_collected++;
+
+ bucket.ndv= 0;
+ bucket.size= 0;
+ }
+
+ /*
+ Same as finalize_bucket() but also provide the bucket's end value.
+ */
+ void finalize_bucket_with_end_value(void *elem)
+ {
+ column->store_field_value((uchar*) elem, col_length);
+ StringBuffer<MAX_FIELD_WIDTH> val;
+ column->val_str(&val);
+ writer.add_member("end").add_str(val.c_ptr());
+ finalize_bucket();
+ }
+
+ /*
+ Write the first value group to the bucket.
+ @param elem The value we are writing
+ @param cnt The number of such values.
+ */
+ void start_bucket(void *elem, element_count cnt)
+ {
+ DBUG_ASSERT(bucket.size == 0);
+ column->store_field_value((uchar*) elem, col_length);
+ StringBuffer<MAX_FIELD_WIDTH> val;
+ column->val_str(&val);
+
+ writer.start_object();
+ writer.add_member("start").add_str(val.c_ptr());
+
+ bucket.ndv= 1;
+ bucket.size= cnt;
+ }
+
+ /*
+ Append a value group of cnt values.
+ */
+ void append_to_bucket(element_count cnt)
+ {
+ bucket.ndv++;
+ bucket.size += cnt;
+ }
+
/*
@brief
- Add data to the histogram. This call adds elem_cnt rows, each
- of which has value of *elem.
+ Add data to the histogram.
@detail
- Subsequent next() calls will add values that are greater than *elem.
+ The call signals to add a "value group" of elem_cnt rows, each of which
+ has the same value that is provided in *elem.
+
+ Subsequent next() calls will add values that are greater than the
+ current one.
+
+ @return
+ 0 - OK
*/
int next(void *elem, element_count elem_cnt) override
{
counters.next(elem, elem_cnt);
ulonglong count= counters.get_count();
- if (curr_bucket == hist_width)
- return 0;
- if (first_value)
+ /*
+ Ok, we've got a "value group" of elem_cnt identical values.
+
+ If we take the values from the value group and put them into
+ the current bucket, how many values will be left after we've
+ filled the bucket?
+ */
+ longlong overflow= bucket.size + elem_cnt - bucket_capacity;
+
+ /*
+ Case #1: This value group should be put into a separate bucket, if
+ A. It fills the current bucket and also fills the next bucket, OR
+ B. It fills the current bucket, which was empty.
+ */
+ if (overflow >= bucket_capacity || (bucket_is_empty() && overflow >= 0))
{
- first_value= false;
- column->store_field_value((uchar*) elem, col_length);
- StringBuffer<MAX_FIELD_WIDTH> val;
- column->val_str(&val);
- bucket_bounds.push_back(std::string(val.ptr(), val.length()));
+ // Finalize the current bucket
+ if (!bucket_is_empty())
+ finalize_bucket();
+
+ // Start/end the separate bucket for this value group.
+ start_bucket(elem, elem_cnt);
+ if (records == count)
+ finalize_bucket_with_end_value(elem);
+ else
+ finalize_bucket();
}
-
- if (count > bucket_capacity * (curr_bucket + 1))
+ else if (overflow >= 0)
{
- column->store_field_value((uchar*) elem, col_length);
- StringBuffer<MAX_FIELD_WIDTH> val;
- column->val_str(&val);
- bucket_bounds.emplace_back(val.ptr(), val.length());
-
- curr_bucket++;
- while (curr_bucket != hist_width &&
- count > bucket_capacity * (curr_bucket + 1))
+ /*
+ Case #2: is when Case#1 doesn't hold, but we can still fill the
+ current bucket.
+ */
+
+ // If the bucket was empty, it would have been case #1.
+ DBUG_ASSERT(!bucket_is_empty());
+
+ /*
+ Finalize the current bucket. Put there enough values to make it hold
+ bucket_capacity values.
+ */
+ append_to_bucket(bucket_capacity - bucket.size);
+ if (records == count && !overflow)
+ finalize_bucket_with_end_value(elem);
+ else
+ finalize_bucket();
+
+ if (overflow > 0)
{
- bucket_bounds.push_back(std::string(val.ptr(), val.length()));
- curr_bucket++;
+ // Then, start the new bucket with the remaining values.
+ start_bucket(elem, overflow);
}
}
+ else
+ {
+ // Case #3: there's not enough values to fill the current bucket.
+ if (bucket_is_empty())
+ start_bucket(elem, elem_cnt);
+ else
+ append_to_bucket(elem_cnt);
+ }
- if (records == count && bucket_bounds.size() == hist_width)
+ if (records == count)
{
- column->store_field_value((uchar*) elem, col_length);
- StringBuffer<MAX_FIELD_WIDTH> val;
- column->val_str(&val);
- bucket_bounds.push_back(std::string(val.ptr(), val.length()));
+ // This is the final value group.
+ if (!bucket_is_empty())
+ finalize_bucket_with_end_value(elem);
}
return 0;
}
@@ -98,17 +223,10 @@ class Histogram_json_builder : public Histogram_builder
*/
void finalize() override
{
- Json_writer writer;
- writer.start_object();
- writer.add_member(Histogram_json_hb::JSON_NAME).start_array();
-
- for(auto& value: bucket_bounds) {
- writer.add_str(value.c_str());
- }
writer.end_array();
writer.end_object();
Binary_string *json_string= (Binary_string *) writer.output.get_string();
- histogram->set_json_text(bucket_bounds.size()-1,
+ histogram->set_json_text(n_buckets_collected,
(uchar *) json_string->c_ptr());
}
};
@@ -143,78 +261,132 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field,
Histogram_type type_arg, const char *hist_data,
size_t hist_data_len)
{
+ const char *err;
DBUG_ENTER("Histogram_json_hb::parse");
DBUG_ASSERT(type_arg == JSON_HB);
- const char *err;
- json_engine_t je;
- json_string_t key_name;
+ const char *obj1;
+ int obj1_len;
+ double cumulative_size= 0.0;
- json_scan_start(&je, &my_charset_utf8mb4_bin,
- (const uchar*)hist_data,
- (const uchar*)hist_data+hist_data_len);
-
- if (json_read_value(&je) || je.value_type != JSON_VALUE_OBJECT)
+ if (JSV_OBJECT != json_type(hist_data, hist_data + hist_data_len,
+ &obj1, &obj1_len))
{
err= "Root JSON element must be a JSON object";
goto error;
}
- json_string_set_str(&key_name, (const uchar*)JSON_NAME,
- (const uchar*)JSON_NAME + strlen(JSON_NAME));
- json_string_set_cs(&key_name, system_charset_info);
-
- if (json_scan_next(&je) || je.state != JST_KEY ||
- !json_key_matches(&je, &key_name))
- {
- err= "The first key in the object must be histogram_hb_v1";
- goto error;
- }
-
- // The value must be a JSON array
- if (json_read_value(&je) || (je.value_type != JSON_VALUE_ARRAY))
+ const char *hist_array;
+ int hist_array_len;
+ if (JSV_ARRAY != json_get_object_key(obj1, obj1 + obj1_len,
+ "histogram_hb_v2", &hist_array,
+ &hist_array_len))
{
err= "A JSON array expected";
goto error;
}
- // Read the array
- while (!json_scan_next(&je))
+ for (int i= 0;; i++)
{
- switch(je.state)
+ const char *bucket_info;
+ int bucket_info_len;
+ enum json_types ret= json_get_array_item(hist_array, hist_array+hist_array_len,
+ i, &bucket_info,
+ &bucket_info_len);
+ if (ret == JSV_NOTHING)
+ break;
+ if (ret == JSV_BAD_JSON)
{
- case JST_VALUE:
- {
- const char *val;
- int val_len;
- json_smart_read_value(&je, &val, &val_len);
- if (je.value_type != JSON_VALUE_STRING &&
- je.value_type != JSON_VALUE_NUMBER &&
- je.value_type != JSON_VALUE_TRUE &&
- je.value_type != JSON_VALUE_FALSE)
- {
- err= "Scalar value expected";
- goto error;
- }
- uchar buf[MAX_KEY_LENGTH];
- uint len_to_copy= field->key_length();
- field->store_text(val, val_len, &my_charset_bin);
- uint bytes= field->get_key_image(buf, len_to_copy, Field::itRAW);
- histogram_bounds.push_back(std::string((char*)buf, bytes));
- // TODO: Should we also compare this endpoint with the previous
- // to verify that the ordering is right?
- break;
- }
- case JST_ARRAY_END:
- break;
+ err= "JSON parse error";
+ goto error;
+ }
+ if (ret != JSV_OBJECT)
+ {
+ err= "Object expected";
+ goto error;
+ }
+
+ // Ok, now we are parsing the JSON object describing the bucket
+ // Read the "start" field.
+ const char *val;
+ int val_len;
+ ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len,
+ "start", &val, &val_len);
+ if (ret != JSV_STRING && ret != JSV_NUMBER)
+ {
+ err= ".start member must be present and be a scalar";
+ goto error;
+ }
+
+ // Read the "size" field.
+ const char *size;
+ int size_len;
+ ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len,
+ "size", &size, &size_len);
+ if (ret != JSV_NUMBER)
+ {
+ err= ".size member must be present and be a scalar";
+ goto error;
+ }
+
+ int conv_err;
+ char *size_end= (char*)size + size_len;
+ double size_d= my_strtod(size, &size_end, &conv_err);
+ if (conv_err)
+ {
+ err= ".size member must be a floating-point value";
+ goto error;
+ }
+ cumulative_size += size_d;
+
+ // Read the "ndv" field
+ const char *ndv;
+ int ndv_len;
+ ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len,
+ "ndv", &ndv, &ndv_len);
+ if (ret != JSV_NUMBER)
+ {
+ err= ".ndv member must be present and be a scalar";
+ goto error;
+ }
+ char *ndv_end= (char*)ndv + ndv_len;
+ longlong ndv_ll= my_strtoll10(ndv, &ndv_end, &conv_err);
+ if (conv_err)
+ {
+ err= ".ndv member must be an integer value";
+ goto error;
+ }
+
+ const char *end_val;
+ int end_val_len;
+ ret= json_get_object_key(bucket_info, bucket_info+bucket_info_len,
+ "end", &end_val, &end_val_len);
+ if (ret != JSV_NOTHING && ret != JSV_STRING && ret !=JSV_NUMBER)
+ {
+ err= ".end member must be a scalar";
+ goto error;
+ }
+ if (ret != JSV_NOTHING)
+ last_bucket_end_endp.assign(end_val, end_val_len);
+
+ buckets.push_back({std::string(val, val_len), NULL, cumulative_size,
+ ndv_ll});
+
+ if (buckets.size())
+ {
+ auto& prev_bucket= buckets[buckets.size()-1];
+ if (prev_bucket.ndv == 1)
+ prev_bucket.end_value= &prev_bucket.start_value;
+ else
+ prev_bucket.end_value= &buckets.back().start_value;
}
}
- // n_buckets = n_bounds - 1 :
- size= histogram_bounds.size()-1;
- DBUG_RETURN(false);
+ buckets.back().end_value= &last_bucket_end_endp;
+ size= buckets.size();
+ DBUG_RETURN(false);
error:
my_error(ER_JSON_HISTOGRAM_PARSE_FAILED, MYF(0), err,
- je.s.c_str - (const uchar*)hist_data);
+ 12345);
DBUG_RETURN(true);
}
@@ -257,7 +429,7 @@ double position_in_interval(Field *field, const uchar *key, uint key_len,
{
store_key_image_to_rec_no_null(field, left.data(), field->key_length());
double min_val_real= field->val_real();
-
+
store_key_image_to_rec_no_null(field, right.data(), field->key_length());
double max_val_real= field->val_real();
@@ -273,37 +445,44 @@ double position_in_interval(Field *field, const uchar *key, uint key_len,
double Histogram_json_hb::point_selectivity(Field *field, key_range *endpoint,
double avg_sel)
{
- double sel;
- store_key_image_to_rec(field, (uchar *) endpoint->key,
- field->key_length());
- const uchar *min_key = endpoint->key;
+ const uchar *key = endpoint->key;
if (field->real_maybe_null())
- min_key++;
- uint min_idx= find_bucket(field, min_key, false);
-
- uint max_idx= find_bucket(field, min_key, true);
-#if 0
- // find how many buckets this value occupies
- while ((max_idx + 1 < get_width() ) &&
- (field->key_cmp((uchar *)histogram_bounds[max_idx + 1].data(), min_key) == 0)) {
- max_idx++;
- }
-#endif
- if (max_idx > min_idx)
+ key++;
+
+ // If the value is outside of the histogram's range, this will "clip" it to
+ // first or last bucket.
+ int idx= find_bucket(field, key, false);
+
+ double sel;
+
+ if (buckets[idx].ndv == 1 &&
+ field->key_cmp((uchar*)buckets[idx].start_value.data(), key))
{
- // value spans multiple buckets
- double bucket_sel= 1.0/(get_width() + 1);
- sel= bucket_sel * (max_idx - min_idx + 1);
+ // The bucket has a single value and it doesn't match! Use the global
+ // average.
+ sel= avg_sel;
}
else
{
- // the value fits within a single bucket
- sel = MY_MIN(avg_sel, 1.0/get_width());
+ /*
+ We get here when:
+ * The bucket has one value and this is the value we are looking for.
+ * The bucket has multiple values. Then, assume
+ */
+ sel= (get_left_fract(idx) - buckets[idx].cum_fract) / buckets[idx].ndv;
}
return sel;
}
+double Histogram_json_hb::get_left_fract(int idx)
+{
+ if (!idx)
+ return 0.0;
+ else
+ return buckets[idx-1].cum_fract;
+}
+
/*
@param field The table field histogram is for. We don't care about the
field's current value, we only need its virtual functions to
@@ -317,7 +496,6 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp,
key_range *max_endp)
{
double min, max;
- double width= 1.0 / histogram_bounds.size();
if (min_endp && !(field->null_ptr && min_endp->key[0]))
{
@@ -333,10 +511,12 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp,
// Find the leftmost bucket that contains the lookup value.
// (If the lookup value is to the left of all buckets, find bucket #0)
int idx= find_bucket(field, min_key, exclusive_endp);
- double min_sel= position_in_interval(field, min_key, min_key_len,
- histogram_bounds[idx],
- histogram_bounds[idx+1]);
- min= idx*width + min_sel*width;
+ double left_fract= get_left_fract(idx);
+ double sel= position_in_interval(field, min_key, min_key_len,
+ buckets[idx].start_value,
+ *buckets[idx].end_value);
+
+ min= left_fract + sel * (buckets[idx].cum_fract - left_fract);
}
else
min= 0.0;
@@ -355,10 +535,11 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp,
}
int idx= find_bucket(field, max_key, inclusive_endp);
- double max_sel= position_in_interval(field, max_key, max_key_len,
- histogram_bounds[idx],
- histogram_bounds[idx+1]);
- max= idx*width + max_sel*width;
+ double left_fract= get_left_fract(idx);
+ double sel= position_in_interval(field, max_key, max_key_len,
+ buckets[idx].start_value,
+ *buckets[idx].end_value);
+ max= left_fract + sel * (buckets[idx].cum_fract - left_fract);
}
else
max= 1.0;
@@ -375,23 +556,35 @@ void Histogram_json_hb::serialize(Field *field)
/*
- Find the histogram bucket that contains the value.
+ Find the rightmost histogram bucket such that "lookup_val $GT start_value".
+
+ $GT is either '>' or '>=' depending on equal_is_less parameter.
@param equal_is_less Controls what to do if a histogram bound is equal to the
lookup_val.
+
+ @detail
+ Possible cases:
+ 1. The regular case: the value falls into some bucket.
+
+ 2. The value is less than the minimum of the first bucket
+ 3. The value is greater than the maximum of the last bucket
+ In these cases we "clip" to the first/last bucket.
+
+ 4. The value hits the bucket boundary. Then, we need to know whether the
+ point of interest is to the left the constant, or to the right of it.
*/
int Histogram_json_hb::find_bucket(Field *field, const uchar *lookup_val,
bool equal_is_less)
{
int low= 0;
- int high= (int)histogram_bounds.size() - 1;
- int middle;
+ int high= (int)buckets.size() - 1;
while (low + 1 < high)
{
- middle= (low + high) / 2;
- int res= field->key_cmp((uchar*)histogram_bounds[middle].data(), lookup_val);
+ int middle= (low + high) / 2;
+ int res= field->key_cmp((uchar*)buckets[middle].start_value.data(), lookup_val);
if (!res)
res= equal_is_less? -1: 1;
if (res < 0)
diff --git a/sql/opt_histogram_json.h b/sql/opt_histogram_json.h
index a83e88a88c4..ed48d951a7f 100644
--- a/sql/opt_histogram_json.h
+++ b/sql/opt_histogram_json.h
@@ -20,6 +20,32 @@
An equi-height histogram which stores real values for bucket bounds.
Handles @@histogram_type=JSON_HB
+
+ Histogram format in JSON:
+
+ {
+ "histogram_hb_v2": [
+ { "start": "value", "size":nnn.nn, "ndv": nnn },
+ ...
+ { "start": "value", "size":nnn.nn, "ndv": nnn, "end": "value"}
+ ]
+ }
+
+ The histogram is an object with single member named "histogram_hb_v2".
+ The value of that member is an array of buckets.
+ Each bucket is an object with these members:
+ "start" - the first value in the bucket.
+ "size" - fraction of table rows that is contained in the bucket.
+ "ndv" - Number of Distinct Values in the bucket.
+ "end" - Optionally, the last value in the bucket.
+
+ A bucket is a single-point bucket if it has ndv=1.
+
+ Most buckets have no "end" member: the bucket is assumed to contain all
+ values up to the "start" of the next bucket.
+
+ The exception is single-point buckets where last value is the same as the
+ first value.
*/
class Histogram_json_hb : public Histogram_base
@@ -29,11 +55,29 @@ class Histogram_json_hb : public Histogram_base
/* Collection-time only: collected histogram in the JSON form. */
std::string json_text;
- // Array of histogram bucket endpoints in KeyTupleFormat.
- std::vector<std::string> histogram_bounds;
+ struct Bucket
+ {
+ // The left endpoint in KeyTupleFormat. The endpoint is inclusive, this
+ // value is in this bucket.
+ std::string start_value;
+
+ // The right endpoint. It is non-inclusive, except for the last bucket.
+ std::string *end_value;
+
+ // Cumulative fraction: The fraction of table rows that fall into this
+ // and preceding buckets.
+ double cum_fract;
+
+ // Number of distinct values in the bucket.
+ longlong ndv;
+ };
+
+ std::vector<Bucket> buckets;
+
+ std::string last_bucket_end_endp;
public:
- static constexpr const char* JSON_NAME="histogram_hb_v1";
+ static constexpr const char* JSON_NAME="histogram_hb_v2";
bool parse(MEM_ROOT *mem_root, Field *field, Histogram_type type_arg,
const char *hist_data, size_t hist_data_len) override;
@@ -80,6 +124,7 @@ class Histogram_json_hb : public Histogram_base
}
private:
+ double get_left_fract(int idx);
int find_bucket(Field *field, const uchar *lookup_val, bool equal_is_less);
};
1
0
revision-id: bfdc2ee636901e6f4c86a94e082092e5edc931a1 (mariadb-10.6.1-122-gbfdc2ee6369)
parent(s): d43552edd3b32209aab3150069a4b4f29c9e2e7c
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-07 10:38:36 +0300
message:
Fix compilation on windows
---
sql/opt_histogram_json.cc | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc
index 2817a257838..f1030662572 100644
--- a/sql/opt_histogram_json.cc
+++ b/sql/opt_histogram_json.cc
@@ -220,11 +220,11 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field,
static
-void store_key_image_to_rec_no_null(Field *field, const char *ptr, uint len)
+void store_key_image_to_rec_no_null(Field *field, const char *ptr, size_t len)
{
MY_BITMAP *old_map= dbug_tmp_use_all_columns(field->table,
&field->table->write_set);
- field->set_key_image((const uchar*)ptr, len);
+ field->set_key_image((const uchar*)ptr, (uint)len);
dbug_tmp_restore_column_map(&field->table->write_set, old_map);
}
1
0
[Commits] d43552edd3b: Correctly decode string field values for pos_in_interval_for_string call
by psergey 06 Sep '21
by psergey 06 Sep '21
06 Sep '21
revision-id: d43552edd3b32209aab3150069a4b4f29c9e2e7c (mariadb-10.6.1-121-gd43552edd3b)
parent(s): 8fc778f3e9cbc339d14653e9e035163e52a582cd
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-06 18:18:08 +0300
message:
Correctly decode string field values for pos_in_interval_for_string call
---
mysql-test/main/statistics_json.result | 6 ++---
sql/field.h | 9 +++++++
sql/opt_histogram_json.cc | 47 ++++++++++++++++++++++------------
3 files changed, 42 insertions(+), 20 deletions(-)
diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result
index aa7b7c08a31..102fcfff194 100644
--- a/mysql-test/main/statistics_json.result
+++ b/mysql-test/main/statistics_json.result
@@ -2452,12 +2452,12 @@ test t1_json a a-0 a-9 0.0000 3.0000 1.0000 100 JSON_HB {
}
explain extended select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 60.27 Using where
+1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 59.41 Using where
Warnings:
Note 1003 select `test`.`t1_json`.`a` AS `a` from `test`.`t1_json` where `test`.`t1_json`.`a` between 'a-3a' and 'zzzzzzzzz'
analyze select * from t1_json where a between 'a-3a' and 'zzzzzzzzz';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 60.27 60.00 Using where
+1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 10.00 59.41 60.00 Using where
explain extended select * from t1_json where a < 'b-1a';
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1_json ALL NULL NULL NULL NULL 10 99.01 Using where
@@ -3179,7 +3179,7 @@ id select_type table type possible_keys key key_len ref rows r_rows filtered r_f
1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 25.49 25.52 Using where
analyze select * from Country use index () where Code < 'BBC';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 5.88 7.11 Using where
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 7.84 7.11 Using where
set histogram_type=@save_histogram_type;
set histogram_size=@save_histogram_size;
DROP SCHEMA world;
diff --git a/sql/field.h b/sql/field.h
index e4224fc1e51..2db81c61b75 100644
--- a/sql/field.h
+++ b/sql/field.h
@@ -1511,11 +1511,20 @@ class Field: public Value_source
if (null_ptr)
null_ptr=ADD_TO_PTR(null_ptr,ptr_diff,uchar*);
}
+
+ /*
+ Copy the Field's value to buff. The value will be in table->record[]
+ format.
+ */
void get_image(uchar *buff, uint length, CHARSET_INFO *cs) const
{ get_image(buff, length, ptr, cs); }
virtual void get_image(uchar *buff, uint length,
const uchar *ptr_arg, CHARSET_INFO *cs) const
{ memcpy(buff,ptr_arg,length); }
+
+ /*
+ Set Field's value to the value in *buf.
+ */
virtual void set_image(const uchar *buff,uint length, CHARSET_INFO *cs)
{ memcpy(ptr,buff,length); }
diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc
index 5f4e0eca585..2817a257838 100644
--- a/sql/opt_histogram_json.cc
+++ b/sql/opt_histogram_json.cc
@@ -220,43 +220,48 @@ bool Histogram_json_hb::parse(MEM_ROOT *mem_root, Field *field,
static
-void store_key_image_to_rec_no_null(Field *field, const uchar *ptr)
+void store_key_image_to_rec_no_null(Field *field, const char *ptr, uint len)
{
MY_BITMAP *old_map= dbug_tmp_use_all_columns(field->table,
&field->table->write_set);
- field->set_key_image(ptr, field->key_length());
+ field->set_key_image((const uchar*)ptr, len);
dbug_tmp_restore_column_map(&field->table->write_set, old_map);
}
static
-double position_in_interval(Field *field, const uchar *key,
+double position_in_interval(Field *field, const uchar *key, uint key_len,
const std::string& left, const std::string& right)
{
double res;
if (field->pos_through_val_str())
{
- uint32 min_len= uint2korr(left.data());
- uint32 max_len= uint2korr(right.data());
- uint32 midp_len= uint2korr(key);
+ StringBuffer<64> buf1, buf2, buf3;
+ String empty_buf1, empty_buf2, empty_buf3;
+
+ store_key_image_to_rec_no_null(field, left.data(), left.size());
+ String *min_str= field->val_str(&buf1, &empty_buf1);
+
+ store_key_image_to_rec_no_null(field, right.data(), right.size());
+ String *max_str= field->val_str(&buf2, &empty_buf2);
+
+ store_key_image_to_rec_no_null(field, (const char*)key, key_len);
+ String *midp_str= field->val_str(&buf3, &empty_buf3);
res= pos_in_interval_for_string(field->charset(),
- key + HA_KEY_BLOB_LENGTH,
- midp_len,
- (const uchar*)left.data() + HA_KEY_BLOB_LENGTH,
- min_len,
- (const uchar*)right.data() + HA_KEY_BLOB_LENGTH,
- max_len);
+ (const uchar*)midp_str->ptr(), midp_str->length(),
+ (const uchar*)min_str->ptr(), min_str->length(),
+ (const uchar*)max_str->ptr(), max_str->length());
}
else
{
- store_key_image_to_rec_no_null(field, (const uchar*)left.data());
+ store_key_image_to_rec_no_null(field, left.data(), field->key_length());
double min_val_real= field->val_real();
- store_key_image_to_rec_no_null(field, (const uchar*)right.data());
+ store_key_image_to_rec_no_null(field, right.data(), field->key_length());
double max_val_real= field->val_real();
- store_key_image_to_rec_no_null(field, key);
+ store_key_image_to_rec_no_null(field, (const char*)key, field->key_length());
double midp_val_real= field->val_real();
res= pos_in_interval_for_double(midp_val_real, min_val_real, max_val_real);
@@ -318,13 +323,17 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp,
{
bool exclusive_endp= (min_endp->flag == HA_READ_AFTER_KEY)? true: false;
const uchar *min_key= min_endp->key;
+ uint min_key_len= min_endp->length;
if (field->real_maybe_null())
+ {
min_key++;
+ min_key_len--;
+ }
// Find the leftmost bucket that contains the lookup value.
// (If the lookup value is to the left of all buckets, find bucket #0)
int idx= find_bucket(field, min_key, exclusive_endp);
- double min_sel= position_in_interval(field, (const uchar*)min_key,
+ double min_sel= position_in_interval(field, min_key, min_key_len,
histogram_bounds[idx],
histogram_bounds[idx+1]);
min= idx*width + min_sel*width;
@@ -338,11 +347,15 @@ double Histogram_json_hb::range_selectivity(Field *field, key_range *min_endp,
DBUG_ASSERT(!(field->null_ptr && max_endp->key[0]));
bool inclusive_endp= (max_endp->flag == HA_READ_AFTER_KEY)? true: false;
const uchar *max_key= max_endp->key;
+ uint max_key_len= max_endp->length;
if (field->real_maybe_null())
+ {
max_key++;
+ max_key_len--;
+ }
int idx= find_bucket(field, max_key, inclusive_endp);
- double max_sel= position_in_interval(field, (const uchar*)max_key,
+ double max_sel= position_in_interval(field, max_key, max_key_len,
histogram_bounds[idx],
histogram_bounds[idx+1]);
max= idx*width + max_sel*width;
1
0
revision-id: 8fc778f3e9cbc339d14653e9e035163e52a582cd (mariadb-10.6.1-120-g8fc778f3e9c)
parent(s): 6352d59d12cb5ab7e6530a74171413ddba5e2870
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-04 23:17:39 +0300
message:
Make tests pass
- Fix bad tests in statistics_json test: make them meaningful and make them
work on windows
- Fix analyze_debug.test: correctly handle errors during ANALYZE
---
mysql-test/main/statistics_json.result | 18 ++++--------------
mysql-test/main/statistics_json.test | 6 ++----
sql/sql_admin.cc | 3 ++-
3 files changed, 8 insertions(+), 19 deletions(-)
diff --git a/mysql-test/main/statistics_json.result b/mysql-test/main/statistics_json.result
index 857b062ae47..aa7b7c08a31 100644
--- a/mysql-test/main/statistics_json.result
+++ b/mysql-test/main/statistics_json.result
@@ -3174,22 +3174,12 @@ Percentage 0.0 99.9 50 JSON_HB {
"99.9"
]
}
-explain extended select * from Country where 'Code' between 'BBC' and 'GGG';
-id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE Country ALL NULL NULL NULL NULL 239 100.00
-Warnings:
-Note 1003 select `world`.`Country`.`Code` AS `Code`,`world`.`Country`.`Name` AS `Name`,`world`.`Country`.`SurfaceArea` AS `SurfaceArea`,`world`.`Country`.`Population` AS `Population`,`world`.`Country`.`Capital` AS `Capital` from `world`.`Country` where 1
-analyze select * from Country where 'Code' between 'BBC' and 'GGG';
+analyze select * from Country use index () where Code between 'BBC' and 'GGG';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 100.00 100.00
-explain extended select * from Country where 'Code' < 'BBC';
-id select_type table type possible_keys key key_len ref rows filtered Extra
-1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
-Warnings:
-Note 1003 select `world`.`Country`.`Code` AS `Code`,`world`.`Country`.`Name` AS `Name`,`world`.`Country`.`SurfaceArea` AS `SurfaceArea`,`world`.`Country`.`Population` AS `Population`,`world`.`Country`.`Capital` AS `Capital` from `world`.`Country` where 0
-analyze select * from Country where 'Code' < 'BBC';
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 25.49 25.52 Using where
+analyze select * from Country use index () where Code < 'BBC';
id select_type table type possible_keys key key_len ref rows r_rows filtered r_filtered Extra
-1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
+1 SIMPLE Country ALL NULL NULL NULL NULL 239 239.00 5.88 7.11 Using where
set histogram_type=@save_histogram_type;
set histogram_size=@save_histogram_size;
DROP SCHEMA world;
diff --git a/mysql-test/main/statistics_json.test b/mysql-test/main/statistics_json.test
index 99705aa38ae..be223f5e4a4 100644
--- a/mysql-test/main/statistics_json.test
+++ b/mysql-test/main/statistics_json.test
@@ -85,10 +85,8 @@ ANALYZE TABLE Country, City, CountryLanguage persistent for all;
--enable_result_log
SELECT column_name, min_value, max_value, hist_size, hist_type, histogram FROM mysql.column_stats;
-explain extended select * from Country where 'Code' between 'BBC' and 'GGG';
-analyze select * from Country where 'Code' between 'BBC' and 'GGG';
-explain extended select * from Country where 'Code' < 'BBC';
-analyze select * from Country where 'Code' < 'BBC';
+analyze select * from Country use index () where Code between 'BBC' and 'GGG';
+analyze select * from Country use index () where Code < 'BBC';
set histogram_type=@save_histogram_type;
set histogram_size=@save_histogram_size;
diff --git a/sql/sql_admin.cc b/sql/sql_admin.cc
index 6a1ea3d31fc..6c3e86bd54c 100644
--- a/sql/sql_admin.cc
+++ b/sql/sql_admin.cc
@@ -1025,7 +1025,8 @@ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
else
compl_result_code= HA_ADMIN_FAILED;
- free_statistics_for_table(thd, table->table);
+ if (table->table)
+ free_statistics_for_table(thd, table->table);
if (compl_result_code)
result_code= HA_ADMIN_FAILED;
else
1
0
revision-id: 6352d59d12cb5ab7e6530a74171413ddba5e2870 (mariadb-10.6.1-119-g6352d59d12c)
parent(s): 95a3f59336a51b960f6d5249ba0635bdc08a9a56
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-04 18:18:19 +0300
message:
Fix compilation on windows part #3
---
sql/opt_histogram_json.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sql/opt_histogram_json.cc b/sql/opt_histogram_json.cc
index cc20165b4db..5f4e0eca585 100644
--- a/sql/opt_histogram_json.cc
+++ b/sql/opt_histogram_json.cc
@@ -372,7 +372,7 @@ int Histogram_json_hb::find_bucket(Field *field, const uchar *lookup_val,
bool equal_is_less)
{
int low= 0;
- int high= histogram_bounds.size() - 1;
+ int high= (int)histogram_bounds.size() - 1;
int middle;
while (low + 1 < high)
1
0
revision-id: 95a3f59336a51b960f6d5249ba0635bdc08a9a56 (mariadb-10.6.1-118-g95a3f59336a)
parent(s): 0e8e1bb308ea0e38f299e91baa5e45850562787a
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-04 18:00:21 +0300
message:
Fix embedded to work
---
libmysqld/CMakeLists.txt | 1 +
1 file changed, 1 insertion(+)
diff --git a/libmysqld/CMakeLists.txt b/libmysqld/CMakeLists.txt
index efdf7277e5b..ef063311690 100644
--- a/libmysqld/CMakeLists.txt
+++ b/libmysqld/CMakeLists.txt
@@ -137,6 +137,7 @@ SET(SQL_EMBEDDED_SOURCES emb_qcache.cc libmysqld.c lib_sql.cc
../sql/opt_trace.cc
../sql/xa.cc
../sql/json_table.cc
+ ../sql/opt_histogram_json.cc
${GEN_SOURCES}
${MYSYS_LIBWRAP_SOURCE}
)
1
0
revision-id: 0e8e1bb308ea0e38f299e91baa5e45850562787a (mariadb-10.6.1-117-g0e8e1bb308e)
parent(s): 2308bd5fbe3f63f93879e9c490ed8154c8de528b
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-04 17:54:07 +0300
message:
Fix compilation on windows part 2
---
sql/opt_histogram_json.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/sql/opt_histogram_json.h b/sql/opt_histogram_json.h
index 4cb61e95293..a83e88a88c4 100644
--- a/sql/opt_histogram_json.h
+++ b/sql/opt_histogram_json.h
@@ -61,7 +61,7 @@ class Histogram_json_hb : public Histogram_base
*/
uint get_size() override
{
- return size;
+ return (uint)size;
}
void init_for_collection(MEM_ROOT *mem_root, Histogram_type htype_arg,
1
0
revision-id: 2308bd5fbe3f63f93879e9c490ed8154c8de528b (mariadb-10.6.1-116-g2308bd5fbe3)
parent(s): 57cc13d177067979dad47307dac8ea41621899c7
author: Sergei Petrunia
committer: Sergei Petrunia
timestamp: 2021-09-04 17:37:24 +0300
message:
Rollback a change from previous commit
---
sql/opt_histogram_json.h | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/sql/opt_histogram_json.h b/sql/opt_histogram_json.h
index 3fbba8814dd..4cb61e95293 100644
--- a/sql/opt_histogram_json.h
+++ b/sql/opt_histogram_json.h
@@ -56,14 +56,12 @@ class Histogram_json_hb : public Histogram_base
/*
@brief
- Legacy: this returns the size of the histogram on disk.
-
- @detail
- This is only called at collection time when json_text is non-empty.
+ This used to be the size of the histogram on disk, which was redundant
+ (one can check the size directly). Return the number of buckets instead.
*/
uint get_size() override
{
- return json_text.size();
+ return size;
}
void init_for_collection(MEM_ROOT *mem_root, Histogram_type htype_arg,
1
0