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MDEV-28882: Assertion `tmp >= 0' failed in best_access_path

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Histogram_json_hb::range_selectivity() may return small negative
numbers due to rounding errors in the histogram.

Make sure the returned value is non-negative.
Add an assert to catch negative values that are not small.

(attempt #2)
This commit is contained in:
Sergei Petrunia
2022-06-22 11:39:53 +03:00
parent 54ac356dea
commit 51bce3c59a
3 changed files with 67 additions and 1 deletions
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16
mysql-test/main/statistics_json.test
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@ -460,3 +460,19 @@ from mysql.column_stats where table_name='t1' and db_name=database();
drop table t1;
--echo #
--echo # MDEV-28882: Assertion `tmp >= 0' failed in best_access_path
--echo #
CREATE TABLE t1 (a varchar(1));
INSERT INTO t1 VALUES ('o'),('s'),('j'),('s'),('y'),('s'),('l'),
('q'),('x'),('m'),('t'),('d'),('v'),('j'),('p'),('t'),('b'),('q');
set histogram_type=json_hb;
analyze table t1 persistent for all;
--echo # filtered must not be negative:
explain format=json select * from t1 where a > 'y';
drop table t1;