Linear_comp_creator Class Reference

Abstract base class for the comparison operators =, <> and <=>. More...

#include <item_cmpfunc.h>

Inheritance diagram for Linear_comp_creator:

Public Member Functions
Item_bool_func *	create (Item *a, Item *b) const override
	This implementation of the factory method also implements flattening of row constructors. More...
bool	eqne_op () const override
bool	l_op () const override
Public Member Functions inherited from Comp_creator
virtual	~Comp_creator ()=default
virtual const char *	symbol (bool invert) const =0
	This interface is only used by Item_allany_subselect. More...

Protected Member Functions
virtual Item_bool_func *	create_scalar_predicate (Item *a, Item *b) const =0
	Creates only an item tree node, without attempting to rewrite row constructors. More...
virtual Item_bool_func *	combine (List< Item > list) const =0
	Combines a list of conditions exp op exp. More...

Detailed Description

Abstract base class for the comparison operators =, <> and <=>.

Member Function Documentation

combine()

virtual Item_bool_func * Linear_comp_creator::combine ( List< Item >  list ) const

protectedpure virtual

Combines a list of conditions exp op exp.

Implemented in Eq_creator, Equal_creator, and Ne_creator.

create()

Item_bool_func * Linear_comp_creator::create ( Item *  a, Item *  b  ) const

overridevirtual

This implementation of the factory method also implements flattening of row constructors.

Examples of flattening are:

• ROW(a, b) op ROW(x, y) => a op x P b op y.
• ROW(a, ROW(b, c) op ROW(x, ROW(y, z))) => a op x P b op y P c op z.

P is either AND or OR, depending on the comparison operation, and this detail is left for combine().

The actual operator op is created by the concrete subclass in create_scalar_predicate().

Implements Comp_creator.

create_scalar_predicate()

virtual Item_bool_func * Linear_comp_creator::create_scalar_predicate ( Item *  a, Item *  b  ) const

protectedpure virtual

Creates only an item tree node, without attempting to rewrite row constructors.

See also

create()

Implemented in Eq_creator, Equal_creator, and Ne_creator.

eqne_op()

bool Linear_comp_creator::eqne_op ( ) const

inlineoverridevirtual

Implements Comp_creator.

l_op()

bool Linear_comp_creator::l_op ( ) const

inlineoverridevirtual

Implements Comp_creator.

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The documentation for this class was generated from the following files:

• sql/item_cmpfunc.h
• sql/item_cmpfunc.cc