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MDEV-17023: Crash during read_histogram_for_table with optimizer_use_condition_selectivity set to 4

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No need to read statistics for tables that are not USER tables.
We allocate memory for structures to collect statistics only for USER TABLES.
This commit is contained in:
Varun Gupta
2018-08-24 01:59:02 +05:30
committed by Marko Mäkelä
parent 7d8d37c31d
commit 69d7bfd970
4 changed files with 41 additions and 0 deletions
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12
mysql-test/t/stat_tables.test
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@ -356,3 +356,15 @@ SELECT * FROM mysql.column_stats;
DROP TABLE t1;
set use_stat_tables=@save_use_stat_tables;
--echo #
--echo # MDEV-17023: Crash during read_histogram_for_table with optimizer_use_condition_selectivity set to 4
--echo #
set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
set @@optimizer_use_condition_selectivity=4;
set @@use_stat_tables= PREFERABLY;
explain
SELECT * FROM INFORMATION_SCHEMA.PROFILING, mysql.user;
set @@optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
set use_stat_tables=@save_use_stat_tables;