database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

MDEV-23221: A subquery causes crash

Browse Source 
* Fix the crash: IN-to-EXISTS rewrite causes an error (and so
  JOIN::optimize() fails with an error, too), don't call
  update_used_tables(). Terminate the query execution instead.

* Fix the cause of the error in the IN-to-EXISTS rewrite: don't do
  the rewrite if doing it will cause an error of this kind:
  This version of MariaDB doesn't yet support 'SUBQUERY in ROW in left
  expression of IN/ALL/ANY'

* Fix another issue exposed by this testcase:
  JOIN::setup_subquery_caches() may be invoked before any select has
  saved its query plan, and will crash because none of the SELECTs
  has called create_explain_query_if_not_exists() to create the Explain
  Data Structure for this SELECT.

TODO: When merging this to 10.2, remove the poorly-placed call to
create_explain_query_if_not_exists made by fix for M_D_E_V-16153
This commit is contained in:
Sergei Petrunia
2020-07-24 22:31:29 +03:00
parent 4b97f14a3d
commit b000d6952f
5 changed files with 139 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
sql/sql_lex.cc
View File

@ -3802,7 +3802,8 @@ bool st_select_lex::optimize_unflattened_subqueries(bool const_only)
sl->options|= SELECT_DESCRIBE;
inner_join->select_options|= SELECT_DESCRIBE;
}
res= inner_join->optimize();
if ((res= inner_join->optimize()))
return TRUE;
if (!inner_join->cleaned)
sl->update_used_tables();
sl->update_correlated_cache();