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MDEV-34870: implement join order hints

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This commit implements optimizer hints allowing to affect the order
of joining tables:

 - JOIN_FIXED_ORDER similar to existing STRAIGHT_JOIN hint;
 - JOIN_ORDER to apply the specified table order;
 - JOIN_PREFIX to hint what tables should be first in the join;
 - JOIN_SUFFIX to hint what tables should be last in the join.
This commit is contained in:
Oleg Smirnov
2025-01-30 20:56:36 +07:00
parent c4fe794d22
commit 349f5bf2da
18 changed files with 4198 additions and 1311 deletions
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30
sql/simple_parser.h
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@@ -519,24 +519,27 @@ protected:
};
/*
A rule consisting of a choice of six rules:
rule ::= rule1 | rule2 | rule3 | rule4 | rule5 | rule6
A rule consisting of a choice of seven rules:
rule ::= rule1 | rule2 | rule3 | rule4 | rule5 | rule6 | rule7
*/
template<class PARSER, class A, class B, class C, class D, class E, class F>
class OR6: public A, public B, public C, public D, public E, public F
template<class PARSER, class A, class B, class C, class D, class E, class F,
class G>
class OR7: public A, public B, public C, public D, public E, public F,
public G
{
public:
OR6()
OR7()
{ }
OR6(OR6 &&rhs)
OR7(OR7 &&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))),
E(std::move(static_cast<E&&>(rhs))),
F(std::move(static_cast<F&&>(rhs)))
F(std::move(static_cast<F&&>(rhs))),
G(std::move(static_cast<G&&>(rhs)))
{ }
OR6 & operator=(OR6 &&rhs)
OR7 & operator=(OR7 &&rhs)
{
A::operator=(std::move(static_cast<A&&>(rhs)));
B::operator=(std::move(static_cast<B&&>(rhs)));
@@ -544,9 +547,10 @@ protected:
D::operator=(std::move(static_cast<D&&>(rhs)));
E::operator=(std::move(static_cast<E&&>(rhs)));
F::operator=(std::move(static_cast<F&&>(rhs)));
G::operator=(std::move(static_cast<G&&>(rhs)));
return *this;
}
OR6(PARSER *p)
OR7(PARSER *p)
:A(p),
B(A::operator bool() ? B() : B(p)),
C(A::operator bool() || B::operator bool() ? C() : C(p)),
@@ -555,14 +559,18 @@ protected:
E(A::operator bool() || B::operator bool() || C::operator bool() ||
D::operator bool() ? E() : E(p)),
F(A::operator bool() || B::operator bool() || C::operator bool() ||
D::operator bool() || E::operator bool() ? F() : F(p))
D::operator bool() || E::operator bool() ? F() : F(p)),
G(A::operator bool() || B::operator bool() || C::operator bool() ||
D::operator bool() || E::operator bool() || F::operator bool() ?
G() : G(p))
{
DBUG_ASSERT(!operator bool() || !p->is_error());
}
operator bool() const
{
return A::operator bool() || B::operator bool() || C::operator bool() ||
D::operator bool() || E::operator bool() || F::operator bool();
D::operator bool() || E::operator bool() || F::operator bool() ||
G::operator bool();
}
};