Distinct_check Class Reference

Checks for queries which have DISTINCT. More...

#include <aggregate_check.h>

Inheritance diagram for Distinct_check:

Public Member Functions
	Distinct_check (Query_block *select_arg)
	Distinct_check (const Distinct_check &)=delete
Distinct_check &	operator= (const Distinct_check &)=delete
bool	check_query (THD *thd)
	Rejects the query if it has a combination of DISTINCT and ORDER BY which could lead to randomly ordered results. More...

Private Attributes
Query_block *const	select
	Query block which we are validating. More...
Item_ident *	failed_ident
	Identifier which triggered an error. More...

Friends
bool	Item_sum::aggregate_check_distinct (uchar *arg)
	Just because we need to go through Item::walk() to reach all items to validate, some work must be delegated to "Item processors" (members of Item); this work conceptually belongs to Distinct_check, and needs privileged access to it. More...
bool	Item_func_grouping::aggregate_check_distinct (uchar *arg)
bool	Item_ident::aggregate_check_distinct (uchar *arg)
bool	Item_func_any_value::aggregate_check_distinct (uchar *arg)

Additional Inherited Members
Protected Member Functions inherited from Item_tree_walker
	Item_tree_walker ()
	~Item_tree_walker ()
	Item_tree_walker (const Item_tree_walker &)=delete
Item_tree_walker &	operator= (const Item_tree_walker &)=delete
void	stop_at (const Item *i)
	Stops walking children of this item. More...
bool	is_stopped (const Item *i)

Detailed Description

Checks for queries which have DISTINCT.

Constructor & Destructor Documentation

Distinct_check() [1/2]

Distinct_check::Distinct_check ( Query_block *  select_arg )

inline

Distinct_check() [2/2]

Distinct_check::Distinct_check ( const Distinct_check &  )

delete

Member Function Documentation

operator=()

Distinct_check & Distinct_check::operator= ( const Distinct_check &  )

delete

Friends And Related Function Documentation

Item_func_any_value::aggregate_check_distinct

bool Item_func_any_value::aggregate_check_distinct ( uchar *  arg )

friend

Item_func_grouping::aggregate_check_distinct

bool Item_func_grouping::aggregate_check_distinct ( uchar *  arg )

friend

Item_ident::aggregate_check_distinct

bool Item_ident::aggregate_check_distinct ( uchar *  arg )

friend

Item_sum::aggregate_check_distinct

bool Item_sum::aggregate_check_distinct ( uchar *  arg )

friend

Just because we need to go through Item::walk() to reach all items to validate, some work must be delegated to "Item processors" (members of Item); this work conceptually belongs to Distinct_check, and needs privileged access to it.

Member Data Documentation

failed_ident

Item_ident* Distinct_check::failed_ident

private

Identifier which triggered an error.

select

Query_block* const Distinct_check::select

private

Query block which we are validating.

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The documentation for this class was generated from the following files:

• sql/aggregate_check.h
• sql/aggregate_check.cc