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MDEV-16757 Memory leak after adding manually min/max statistical data

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for blob column

ANALYZE TABLE <table> does not collect statistical data on min/max values
for BLOB columns of <table>. However these values can be added into
mysql.column_stats manually by executing proper statements.
Unfortunately this led to a memory leak because the memory allocated
for these values was never freed.
This patch provides the server with a function to free memory allocated
for min/max statistical values of BLOB types.
This commit is contained in:
Igor Babaev
2018-07-13 17:48:30 -07:00
parent ad9d1e8c3f
commit c89bb15c31
6 changed files with 116 additions and 0 deletions
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24
mysql-test/t/stat_tables.test
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@ -312,3 +312,27 @@ drop table t1;
SET use_stat_tables = PREFERABLY;
SELECT CONVERT_TZ( '1991-09-20 10:11:02', '+00:00', 'GMT' );
set use_stat_tables=@save_use_stat_tables;
--echo #
--echo # MDEV-16757: manual addition of min/max statistics for BLOB
--echo #
SET use_stat_tables= PREFERABLY;
CREATE TABLE t1 (pk INT PRIMARY KEY, t TEXT);
INSERT INTO t1 VALUES (1,'foo'),(2,'bar');
ANALYZE TABLE t1;
--sorted_result
SELECT * FROM mysql.column_stats;
DELETE FROM mysql.column_stats
WHERE db_name='test' AND table_name='t1' AND column_name='t';
INSERT INTO mysql.column_stats VALUES
('test','t1','t','bar','foo', 0.0, 3.0, 1.0, 0, NULL, NULL);
--sorted_result
SELECT * FROM mysql.column_stats;
SELECT pk FROM t1;
DROP TABLE t1;
set use_stat_tables=@save_use_stat_tables;