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| author | Sergei Petrunia <psergey@askmonty.org> | 2021-10-22 19:43:19 +0300 |
|---|---|---|
| committer | Sergei Petrunia <psergey@askmonty.org> | 2022-01-19 18:10:11 +0300 |
| commit | 05877df472fa95cab763dfb1299e81681a12da73 (patch) | |
| tree | 00753389e2ddeb3931cb3fdb605b2c92064373b1 /mysql-test/main/statistics_json.test | |
| parent | f3f78bed8530e1e858d5ed87054f2ac672760824 (diff) | |
| download | mariadb-git-05877df472fa95cab763dfb1299e81681a12da73.tar.gz | |
MDEV-26849: JSON Histograms: point selectivity estimates are off
.. for non-existent values.
Handle this special case.
Diffstat (limited to 'mysql-test/main/statistics_json.test')
| -rw-r--r-- | mysql-test/main/statistics_json.test | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/mysql-test/main/statistics_json.test b/mysql-test/main/statistics_json.test index 352150e8497..e968c910f4b 100644 --- a/mysql-test/main/statistics_json.test +++ b/mysql-test/main/statistics_json.test @@ -295,3 +295,25 @@ select c from t1 where c > '1'; drop table t1; +--echo # +--echo # MDEV-26849: JSON Histograms: point selectivity estimates are off for non-existent values +--echo # +--echo # + +create table t0(a int); +insert into t0 (a) values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); +create table t1(a int); +insert into t1 select 100*A.a from t0 A, t0 B, t0 C; +select a, count(*) from t1 group by a order by a; +set histogram_type=json_hb, histogram_size=default; +analyze table t1 persistent for all; +select * from mysql.column_stats where table_name='t1'; +analyze select * from t1 where a=0; +analyze select * from t1 where a=50; +analyze select * from t1 where a=70; +analyze select * from t1 where a=100; +analyze select * from t1 where a=150; +analyze select * from t1 where a=200; + +drop table t0,t1; + |