item_sum.cc File Reference

Sum functions (COUNT, MIN...) More...

#include "sql_priv.h"
#include "sql_select.h"
#include "sql_tmp_table.h"
#include "sql_resolver.h"
#include "sql_optimizer.h"

Functions
int	group_concat_key_cmp_with_distinct (const void *arg, const void *key1, const void *key2)
int	group_concat_key_cmp_with_order (const void *arg, const void *key1, const void *key2)
int	dump_leaf_key (void *key_arg, element_count count __attribute__((unused)), void *item_arg)

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Detailed Description

Sum functions (COUNT, MIN...)

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Function Documentation

int dump_leaf_key	(	void *	key_arg,
		element_count count	__attribute__(unused),
		void *	item_arg
	)

Append data from current leaf to item->result.

To avoid duplicated warnings in Item_func_group_concat::val_str()

int group_concat_key_cmp_with_distinct	(	const void *	arg,
		const void *	key1,
		const void *	key2
	)

Compares the values for fields in expr list of GROUP_CONCAT.

Note:

GROUP_CONCAT([DISTINCT] expr [,expr ...] [ORDER BY {unsigned_integer | col_name | expr} [ASC | DESC] [,col_name ...]] [SEPARATOR str_val])

Returns:

Return values:

-1	: key1 < key2
0	: key1 = key2
1	: key1 > key2

int group_concat_key_cmp_with_order	(	const void *	arg,
		const void *	key1,
		const void *	key2
	)

function of sort for syntax: GROUP_CONCAT(expr,... ORDER BY col,... )