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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_parse.cc
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@@ -3822,7 +3822,7 @@ mysql_execute_command(THD *thd, bool is_called_from_prepared_stmt)
thd->query_plan_flags|= QPLAN_ADMIN;
/* Start timeouts */
thd->set_query_timer();
thd->set_query_timer_if_needed();
#ifdef WITH_WSREP
/* Check wsrep_mode rules before command execution. */