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MDEV-34860 Implement MAX_EXECUTION_TIME hint

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It places a limit N (a timeout value in milliseconds) on how long
a statement is permitted to execute before the server terminates it.

Syntax:
SELECT /*+ MAX_EXECUTION_TIME(milliseconds) */ ...

Only top-level SELECT statements support the hint.
This commit is contained in:
Oleg Smirnov
2024-08-07 22:10:50 +07:00
parent 1e2774d829
commit 67319f3e8d
20 changed files with 573 additions and 51 deletions
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sql/sql_select.cc
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@@ -1468,7 +1468,7 @@ JOIN::prepare(TABLE_LIST *tables_init, COND *conds_init, uint og_num,
if (!(select_options & OPTION_SETUP_TABLES_DONE) &&
setup_tables_and_check_access(thd, &select_lex->context, join_list,
tables_list, select_lex->leaf_tables,
FALSE, SELECT_ACL, SELECT_ACL, FALSE))
false, SELECT_ACL, SELECT_ACL, false, true))
DBUG_RETURN(-1);
/* System Versioning: handle FOR SYSTEM_TIME clause. */