~drizzle-trunk/drizzle/development

/*****************************************************************************

Copyright (c) 1997, 2009, Innobase Oy. All Rights Reserved.

This program is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free Software

Foundation; version 2 of the License.

This program is distributed in the hope that it will be useful, but WITHOUT

ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with

this program; if not, write to the Free Software Foundation, Inc., 51 Franklin

St, Fifth Floor, Boston, MA 02110-1301 USA

*****************************************************************************/

/**************************************************//**

@file include/eval0eval.h

SQL evaluator: evaluates simple data structures, like expressions, in

a query graph

Created 12/29/1997 Heikki Tuuri

*******************************************************/

#ifndef eval0eval_h

#define eval0eval_h

#include "univ.i"

#include "que0types.h"

#include "pars0sym.h"

#include "pars0pars.h"

/*****************************************************************//**

Free the buffer from global dynamic memory for a value of a que_node,

if it has been allocated in the above function. The freeing for pushed

column values is done in sel_col_prefetch_buf_free. */

UNIV_INTERN

void

eval_node_free_val_buf(

/*===================*/

	que_node_t*	node);	/*!< in: query graph node */

/*****************************************************************//**

Evaluates a symbol table symbol. */

UNIV_INLINE

void

eval_sym(

/*=====*/

	sym_node_t*	sym_node);	/*!< in: symbol table node */

/*****************************************************************//**

Evaluates an expression. */

UNIV_INLINE

void

eval_exp(

/*=====*/

	que_node_t*	exp_node);	/*!< in: expression */

/*****************************************************************//**

Sets an integer value as the value of an expression node. */

UNIV_INLINE

void

eval_node_set_int_val(

/*==================*/

	que_node_t*	node,	/*!< in: expression node */

	lint		val);	/*!< in: value to set */

/*****************************************************************//**

Gets an integer value from an expression node.

@return	integer value */

UNIV_INLINE

lint

eval_node_get_int_val(

/*==================*/

	que_node_t*	node);	/*!< in: expression node */

/*****************************************************************//**

Copies a binary string value as the value of a query graph node. Allocates a

new buffer if necessary. */

UNIV_INLINE

void

eval_node_copy_and_alloc_val(

/*=========================*/

	que_node_t*	node,	/*!< in: query graph node */

	const byte*	str,	/*!< in: binary string */

	ulint		len);	/*!< in: string length or UNIV_SQL_NULL */

/*****************************************************************//**

Copies a query node value to another node. */

UNIV_INLINE

void

eval_node_copy_val(

/*===============*/

	que_node_t*	node1,	/*!< in: node to copy to */

	que_node_t*	node2);	/*!< in: node to copy from */

/*****************************************************************//**

Gets a iboolean value from a query node.

@return	iboolean value */

UNIV_INLINE

ibool

eval_node_get_ibool_val(

/*====================*/

	que_node_t*	node);	/*!< in: query graph node */

/*****************************************************************//**

Evaluates a comparison node.

@return	the result of the comparison */

UNIV_INTERN

ibool

eval_cmp(

/*=====*/

	func_node_t*	cmp_node);	/*!< in: comparison node */

#ifndef UNIV_NONINL

#include "eval0eval.ic"

#endif

#endif