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

#include "eval0eval.h"
#include "data0data.h"
#include "rem0cmp.h"
#include "row0sel.h"

Functions
static que_node_t *	que_node_get_like_node (que_node_t *node)

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...

void	eval_node_free_val_buf (que_node_t *node)
	Free the buffer from global dynamic memory for a value of a que_node, if it has been allocated in the above function. More...

static bool	eval_cmp_like (que_node_t arg1, que_node_t arg2)

bool	eval_cmp (func_node_t *cmp_node)
	Evaluates a comparison node. More...

static void	eval_logical (func_node_t *logical_node)
	Evaluates a logical operation node. More...

static void	eval_arith (func_node_t *arith_node)
	Evaluates an arithmetic operation node. More...

static void	eval_aggregate (func_node_t *node)
	Evaluates an aggregate operation node. More...

static void	eval_notfound (func_node_t *func_node)
	Evaluates a notfound-function node. More...

static void	eval_substr (func_node_t *func_node)
	Evaluates a substr-function node. More...

static void	eval_instr (func_node_t *func_node)
	Evaluates an instr-function node. More...

static void	eval_concat (func_node_t *func_node)
	Evaluates a predefined function node. More...

static void	eval_to_binary (func_node_t *func_node)
	Evaluates a predefined function node. More...

static void	eval_length (func_node_t *func_node)
	Evaluate the predefined LENGTH function. More...

void	eval_func (func_node_t *func_node)
	Evaluates a function node. More...

Variables
static byte	eval_dummy
	Dummy address used when we should allocate a buffer of size 0 in eval_node_alloc_val_buf. More...

Detailed Description

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

Created 12/29/1997 Heikki Tuuri

Function Documentation

◆ eval_aggregate()

static void eval_aggregate ( func_node_t * node )

inlinestatic

Evaluates an aggregate operation node.

Parameters

node	in: aggregate operation node

◆ eval_arith()

static void eval_arith ( func_node_t * arith_node )

inlinestatic

Evaluates an arithmetic operation node.

Parameters

arith_node in: arithmetic operation node

◆ eval_cmp()

bool eval_cmp ( func_node_t * cmp_node )

Evaluates a comparison node.

Returns: the result of the comparison in: comparison node

Parameters

cmp_node in: comparison node

◆ eval_cmp_like()

static bool eval_cmp_like	(	que_node_t *	arg1,
		que_node_t *	arg2
	)

inlinestatic

◆ eval_concat()

static void eval_concat ( func_node_t * func_node )

static

Evaluates a predefined function node.

Parameters

func_node in: function node

◆ eval_func()

void eval_func ( func_node_t * func_node )

Evaluates a function node.

in: function node

Parameters

func_node in: function node

◆ eval_instr()

static void eval_instr ( func_node_t * func_node )

static

Evaluates an instr-function node.

Parameters

func_node in: function node

◆ eval_length()

static void eval_length ( func_node_t * func_node )

inlinestatic

Evaluate the predefined LENGTH function.

Parameters

func_node in: function node

◆ eval_logical()

static void eval_logical ( func_node_t * logical_node )

inlinestatic

Evaluates a logical operation node.

Parameters

logical_node in: logical operation 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 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_free_val_buf()

void eval_node_free_val_buf ( que_node_t * node )

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.

Parameters

node	in: query graph node

◆ eval_notfound()

static void eval_notfound ( func_node_t * func_node )

inlinestatic

Evaluates a notfound-function node.

Parameters

func_node in: function node

◆ eval_substr()

static void eval_substr ( func_node_t * func_node )

inlinestatic

Evaluates a substr-function node.

Parameters

func_node in: function node

◆ eval_to_binary()

static void eval_to_binary ( func_node_t * func_node )

inlinestatic

Evaluates a predefined function node.

If the first argument is an integer, this function looks at the second argument which is the integer length in bytes, and converts the integer to a VARCHAR. If the first argument is of some other type, this function converts it to BINARY.

Parameters

func_node in: function node

◆ que_node_get_like_node()

static que_node_t * que_node_get_like_node ( que_node_t * node )

inlinestatic

Variable Documentation

◆ eval_dummy

byte eval_dummy

static

Dummy address used when we should allocate a buffer of size 0 in eval_node_alloc_val_buf.

Functions

Variables

Detailed Description

Function Documentation

◆ eval_aggregate()

◆ eval_arith()

◆ eval_cmp()

◆ eval_cmp_like()

◆ eval_concat()

◆ eval_func()

◆ eval_instr()

◆ eval_length()

◆ eval_logical()

◆ eval_node_alloc_val_buf()

◆ eval_node_free_val_buf()

◆ eval_notfound()

◆ eval_substr()

◆ eval_to_binary()

◆ que_node_get_like_node()

Variable Documentation

◆ eval_dummy