Base class for result from a subquery. More...

#include <query_result.h>

Inheritance diagram for Query_result_subquery:

Public Member Functions
	Query_result_subquery (Item_subselect *item_arg)

bool	send_data (THD thd, const mem_root_deque< Item > &items) override=0

bool	send_eof (THD *) override

Public Member Functions inherited from Query_result_interceptor
	Query_result_interceptor ()

uint	field_count (const mem_root_deque< Item * > &) const override

bool	send_result_set_metadata (THD , const mem_root_deque< Item > &, uint) override

bool	is_interceptor () const final
	Checks if this Query_result intercepts and transforms the result set. More...

Public Member Functions inherited from Query_result
	Query_result ()

virtual	~Query_result ()=default

virtual bool	needs_file_privilege () const

virtual bool	change_query_result (THD , Query_result )
	Change wrapped Query_result. More...

virtual bool	need_explain_interceptor () const

virtual bool	prepare (THD , const mem_root_deque< Item > &, Query_expression *u)
	Perform preparation specific to the query expression or DML statement. More...

virtual bool	start_execution (THD *)
	Prepare for execution of the query expression or DML statement. More...

virtual bool	create_table_for_query_block (THD *)
	Create table, only needed to support CREATE TABLE ... SELECT. More...

virtual bool	check_supports_cursor () const
	Check if this query result set supports cursors. More...

virtual void	abort_result_set (THD *)

virtual bool	reset ()
	Cleanup after one execution of the unit, to be ready for a next execution inside the same statement. More...

virtual void	cleanup ()
	Cleanup after this execution. More...

virtual void	set_limit (ha_rows)
	Only overridden (and non-empty) for Query_result_union, q.v. More...

virtual Server_side_cursor *	cursor () const

Protected Attributes
Item_subselect *	item

Protected Attributes inherited from Query_result
Query_expression *	unit

Additional Inherited Members
Public Attributes inherited from Query_result
ha_rows	estimated_rowcount
	Number of records estimated in this result. More...

double	estimated_cost
	Cost to execute the subquery which produces this result. More...

Detailed Description

Base class for result from a subquery.

Constructor & Destructor Documentation

◆ Query_result_subquery()

Query_result_subquery::Query_result_subquery ( Item_subselect * item_arg )

inlineexplicit

Member Function Documentation

◆ send_data()

bool Query_result_subquery::send_data	(	THD *	thd,
		const mem_root_deque< Item * > &	items
	)

overridepure virtual

Implements Query_result.

Implemented in Query_result_scalar_subquery, Query_result_max_min_subquery, and Query_result_exists_subquery.

◆ send_eof()

bool Query_result_subquery::send_eof ( THD * )

inlineoverridevirtual

Implements Query_result.

Member Data Documentation

◆ item

Item_subselect* Query_result_subquery::item

protected

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

sql/query_result.h

Public Member Functions

Protected Attributes

Additional Inherited Members