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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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47
sql/simple_parser.h
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@@ -380,7 +380,7 @@ protected:
/*
A rule consisting of a choice of thee rules:
A rule consisting of a choice of three rules:
rule ::= rule1 | rule2 | rule3
For the case when the three branches have incompatible storage
@@ -478,7 +478,50 @@ protected:
/*
A list with at least MIN_COUNT elements (typlically 0 or 1),
A rule consisting of a choice of four rules:
rule ::= rule1 | rule2 | rule3 | rule4
For the case when the three branches have incompatible storage
*/
template<class PARSER, class A, class B, class C, class D>
class OR4: public A, public B, public C, public D
{
public:
OR4()
{ }
OR4(OR4 &&rhs)
:A(std::move(static_cast<A&&>(rhs))),
B(std::move(static_cast<B&&>(rhs))),
C(std::move(static_cast<C&&>(rhs))),
D(std::move(static_cast<D&&>(rhs)))
{ }
OR4 & operator=(OR4 &&rhs)
{
A::operator=(std::move(static_cast<A&&>(rhs)));
B::operator=(std::move(static_cast<B&&>(rhs)));
C::operator=(std::move(static_cast<C&&>(rhs)));
D::operator=(std::move(static_cast<D&&>(rhs)));
return *this;
}
OR4(PARSER *p)
:A(p),
B(A::operator bool() ? B() : B(p)),
C(A::operator bool() || B::operator bool() ? C() : C(p)),
D(A::operator bool() || B::operator bool() || C::operator bool() ?
D() : D(p))
{
DBUG_ASSERT(!operator bool() || !p->is_error());
}
operator bool() const
{
return A::operator bool() || B::operator bool() || C::operator bool() ||
D::operator bool();
}
};
/*
A list with at least MIN_COUNT elements (typically 0 or 1),
with or without a token separator between elements:
list ::= element [ {, element }... ] // with a separator