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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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19
sql/opt_hints_parser.cc
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@@ -57,11 +57,30 @@ Optimizer_hint_tokenizer::find_keyword(const LEX_CSTRING &str)
return TokenID::keyword_QB_NAME;
break;
case 18:
if ("MAX_EXECUTION_TIME"_Lex_ident_column.streq(str))
return TokenID::keyword_MAX_EXECUTION_TIME;
break;
case 21:
if ("NO_RANGE_OPTIMIZATION"_Lex_ident_column.streq(str))
return TokenID::keyword_NO_RANGE_OPTIMIZATION;
break;
}
if (str.length > 0 && (str.str[0] >= '0' && str.str[0] <= '9'))
{
/*
If all characters are digits, qualify the token as a number,
otherwise as an identifier
*/
for(size_t i = 1; i < str.length; i++)
{
if (str.str[i] < '0' || str.str[i] > '9')
return TokenID::tIDENT;
}
return TokenID::tUNSIGNED_NUMBER;
}
return TokenID::tIDENT;
}