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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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8
sql/sql_class.h
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@ -6040,7 +6040,7 @@ public:
ulonglong num_of_strings_sorted_on_truncated_length;
public:
void set_query_timer()
void set_query_timer_if_needed()
{
#ifndef EMBEDDED_LIBRARY
/*
@ -6059,9 +6059,13 @@ public:
*/
if (!timeout_val || spcont || in_sub_stmt || query_timer.expired == 0)
return;
thr_timer_settime(&query_timer, timeout_val);
set_query_timer_force(timeout_val);
#endif
}
void set_query_timer_force(ulonglong timeout_val)
{
thr_timer_settime(&query_timer, timeout_val);
}
void reset_query_timer()
{
#ifndef EMBEDDED_LIBRARY