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MDEV-27229: Estimation for filtered rows less precise ... #5

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Fix special handling for values that are right next to buckets with ndv=1.
This commit is contained in:
Sergei Petrunia
2022-01-08 22:36:12 +03:00
committed by Sergei Petrunia
parent 67d4d0426f
commit 531dd708ef
4 changed files with 150 additions and 57 deletions
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26
mysql-test/main/statistics_json.test
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@ -390,3 +390,29 @@ analyze table t1 persistent for all;
analyze select COUNT(*) FROM t1 WHERE a <> 'a';
analyze select COUNT(*) FROM t1 WHERE a < 'a';
drop table t1;
--echo #
--echo # MDEV-27229: Estimation for filtered rows less precise ... #5
--echo #
create table t1 (id int, a varchar(8));
insert into t1 select seq, 'bar' from seq_1_to_100;
insert into t1 select id, 'qux' from t1;
set histogram_type=JSON_HB;
analyze table t1 persistent for all;
analyze select COUNT(*) FROM t1 WHERE a > 'foo';
analyze select COUNT(*) FROM t1 WHERE a > 'aaa';
analyze select COUNT(*) FROM t1 WHERE a >='aaa';
analyze select COUNT(*) FROM t1 WHERE a > 'bar';
analyze select COUNT(*) FROM t1 WHERE a >='bar';
# Can enable these after get_avg_frequency issue is resolved:
# analyze select COUNT(*) FROM t1 WHERE a < 'aaa';
# analyze select COUNT(*) FROM t1 WHERE a <='aaa';
# analyze select COUNT(*) FROM t1 WHERE a < 'bar';
analyze select COUNT(*) FROM t1 WHERE a <='bar';
drop table t1;