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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.

Temporarily changed the test case until MDEV-16711 is fixed as without
this fix the test case for MDEV-16757 did not fail only for 10.0.
This commit is contained in:
Igor Babaev
2018-07-15 16:24:24 -07:00
parent 1d10c9afe0
commit 095dc81158
6 changed files with 108 additions and 0 deletions
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sql/sql_statistics.h
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@ -92,6 +92,7 @@ int read_statistics_for_tables_if_needed(THD *thd, TABLE_LIST *tables);
int collect_statistics_for_table(THD *thd, TABLE *table);
int alloc_statistics_for_table_share(THD* thd, TABLE_SHARE *share,
bool is_safe);
void delete_stat_values_for_table_share(TABLE_SHARE *table_share);
int alloc_statistics_for_table(THD *thd, TABLE *table);
int update_statistics_for_table(THD *thd, TABLE *table);
int delete_statistics_for_table(THD *thd, LEX_STRING *db, LEX_STRING *tab);