sql_derived.h File Reference

#include "sql/item.h"
#include "sql/opt_trace_context.h"
#include "sql/sql_const.h"
#include "sql/sql_lex.h"

Go to the source code of this file.

Classes
class	Condition_pushdown
	Class which handles pushing conditions down to a materialized derived table. More...
class	Condition_pushdown::Derived_table_info
	Used to pass information during condition pushdown. More...

Functions
Item *	parse_expression (THD *thd, Item *item, Query_block *query_block, Table_ref *derived_table)
	Given an item and a query block, this function creates a clone of the item (unresolved) by reparsing the item. More...

Function Documentation

parse_expression()

Item * parse_expression	(	THD *	thd,
		Item *	item,
		Query_block *	query_block,
		Table_ref *	derived_table
	)

Given an item and a query block, this function creates a clone of the item (unresolved) by reparsing the item.

Used during condition pushdown to derived tables and during inlining of stored functions.

Parameters

thd	Current thread.
item	Item to be reparsed to get a clone.
query_block	query block where expression is being parsed
derived_table	derived table to which the item belongs to. "nullptr" either when cloning to make a copy of the original condition to be pushed down to a derived table that has SET operations or when the function is used for stored function inlining.

Returns

A copy of the original item (unresolved) on success else nullptr.