Item_func_eq Class Reference

Inheritance diagram for Item_func_eq:

List of all members.

Public Member Functions
	Item_func_eq (Item *a, Item *b)
longlong	val_int ()
enum Functype	functype () const
enum Functype	rev_functype () const
cond_result	eq_cmp_result () const
const char *	func_name () const
Item *	negated_item ()
virtual bool	equality_substitution_analyzer (uchar **arg)
virtual Item *	equality_substitution_transformer (uchar *arg)

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Member Function Documentation

Item * Item_func_eq::equality_substitution_transformer

(

uchar *

arg

)

[virtual]

Replace arg of Item_func_eq object after having added a table that represents a materialized semi-join.

The right argument of an injected semi-join equality (which comes from the select list of the subquery) is replaced with the corresponding column from the materialized temporary table, if the left and right arguments are not from the same semi-join nest.

See also:

JOIN::update_equalities_for_sjm() for why this is needed.

Reimplemented from Item.

Item * Item_func_eq::negated_item

(

)

[virtual]

just fake method, should never be called.

Reimplemented from Item_bool_rowready_func2.

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

• item_cmpfunc.h
• item_cmpfunc.cc