eval0eval.ic File Reference

SQL evaluator: evaluates simple data structures, like expressions, in a query graph. More...

#include "pars0grm.h"
#include "que0que.h"
#include "rem0cmp.h"

Functions
void	eval_func (func_node_t *func_node)
	Evaluates a function node. More...
byte *	eval_node_alloc_val_buf (que_node_t *node, ulint size)
	Allocate a buffer from global dynamic memory for a value of a que_node. More...
static byte *	eval_node_ensure_val_buf (que_node_t *node, ulint size)
	Allocates a new buffer if needed. More...
static void	eval_sym (sym_node_t *sym_node)
	Evaluates a symbol table symbol. More...
static void	eval_exp (que_node_t *exp_node)
	Evaluates an expression. More...
static void	eval_node_set_int_val (que_node_t *node, lint val)
	Sets an integer value as the value of an expression node. More...
static lint	eval_node_get_int_val (que_node_t *node)
	Gets an integer non-SQL null value from an expression node. More...
static bool	eval_node_get_bool_val (que_node_t *node)
	Gets a boolean value from a query node. More...
static void	eval_node_set_bool_val (func_node_t *func_node, bool val)
	Sets a boolean value as the value of a function node. More...
static void	eval_node_copy_and_alloc_val (que_node_t *node, const byte *str, ulint len)
	Copies a binary string value as the value of a query graph node. More...
static void	eval_node_copy_val (que_node_t *node1, que_node_t *node2)
	Copies a query node value to another node. More...

Detailed Description

SQL evaluator: evaluates simple data structures, like expressions, in a query graph.

Created 12/29/1997 Heikki Tuuri

Function Documentation

eval_exp()

static void eval_exp ( que_node_t *  exp_node )

inlinestatic

Evaluates an expression.

Parameters

exp_node

in: expression

eval_func()

void eval_func

(

func_node_t *

func_node

)

Evaluates a function node.

in: function node

Parameters

func_node

in: function node

eval_node_alloc_val_buf()

byte * eval_node_alloc_val_buf	(	que_node_t *	node,
		ulint	size
	)

Allocate a buffer from global dynamic memory for a value of a que_node.

NOTE that this memory must be explicitly freed when the query graph is freed. If the node already has allocated buffer, that buffer is freed here. NOTE that this is the only function where dynamic memory should be allocated for a query node val field.

Returns

pointer to allocated buffer in: buffer size

NOTE that this memory must be explicitly freed when the query graph is freed. If the node already has an allocated buffer, that buffer is freed here. NOTE that this is the only function where dynamic memory should be allocated for a query node val field.

Returns

pointer to allocated buffer

Parameters

node	in: query graph node; sets the val field data field to point to the new buffer, and len field equal to size
size	in: buffer size

eval_node_copy_and_alloc_val()

static void eval_node_copy_and_alloc_val ( que_node_t *  node, const byte *  str, ulint  len  )

inlinestatic

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

Allocates a new buffer if necessary.

Parameters

node	in: query graph node
str	in: binary string
len	in: string length or UNIV_SQL_NULL

eval_node_copy_val()

static void eval_node_copy_val ( que_node_t *  node1, que_node_t *  node2  )

inlinestatic

Copies a query node value to another node.

Parameters

node1	in: node to copy to
node2	in: node to copy from

eval_node_ensure_val_buf()

static byte * eval_node_ensure_val_buf ( que_node_t *  node, ulint  size  )

inlinestatic

Allocates a new buffer if needed.

Returns

pointer to buffer

Parameters

node	in: query graph node; sets the val field data field to point to the new buffer, and len field equal to size
size	in: buffer size

eval_node_get_bool_val()

static bool eval_node_get_bool_val ( que_node_t *  node )

inlinestatic

Gets a boolean value from a query node.

Returns

boolean value

Parameters

node	in: query graph node

eval_node_get_int_val()

static lint eval_node_get_int_val ( que_node_t *  node )

inlinestatic

Gets an integer non-SQL null value from an expression node.

Returns

integer value

Parameters

node	in: expression node

eval_node_set_bool_val()

static void eval_node_set_bool_val ( func_node_t *  func_node, bool  val  )

inlinestatic

Sets a boolean value as the value of a function node.

Parameters

func_node	in: function node
val	in: value to set

eval_node_set_int_val()

static void eval_node_set_int_val ( que_node_t *  node, lint  val  )

inlinestatic

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

Parameters

node	in: expression node
val	in: value to set

eval_sym()

static void eval_sym ( sym_node_t *  sym_node )

inlinestatic

Evaluates a symbol table symbol.

Parameters

sym_node

in: symbol table node