#include <sql_union.h>

Inheritance diagram for Query_result_union:

Public Member Functions
	Query_result_union ()

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

virtual bool	postponed_prepare (THD thd[[maybe_unused]], const mem_root_deque< Item > &types[[maybe_unused]])
	Do prepare() if preparation has been postponed until column type information is computed (used by Query_result_union_direct). More...

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

bool	send_eof (THD *thd) override

virtual bool	flush ()

void	cleanup (THD *) override
	Cleanup after this execution. More...

bool	reset () override
	Reset and empty the temporary table that stores the materialized query result. More...

bool	create_result_table (THD thd, const mem_root_deque< Item > &column_types, bool is_distinct, ulonglong options, const char *alias, bool bit_fields_as_long, bool create_table)
	Create a temporary table to store the result of a query expression (used, among others, when materializing a UNION DISTINCT). More...

const ha_rows *	row_count () const 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	optimize ()
	Optimize the result processing of a query expression, applicable to data change operation (not simple select queries). 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 void	send_error (THD , uint errcode, const char err)

virtual bool	check_simple_query_block () const
	Check if this query returns a result set and therefore is allowed in cursors and set an error message if it is not the case. More...

virtual void	abort_result_set (THD *)

void	begin_dataset ()

virtual bool	immediate_update (TABLE_LIST *t[[maybe_unused]]) const
	If this Query_result performs modifications to tables: tells if it modifies the given table's row as it's read (a.k.a. More...

Public Attributes
TABLE *	table

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...

Protected Attributes
Temp_table_param	tmp_table_param

ha_rows	m_rows_in_table
	Count of rows successfully stored in tmp table. More...

Protected Attributes inherited from Query_result
Query_expression *	unit

Friends
bool	TABLE_LIST::create_materialized_table (THD *thd)

bool	TABLE_LIST::optimize_derived (THD *thd)

Constructor & Destructor Documentation

◆ Query_result_union()

Query_result_union::Query_result_union ( )

inline

Member Function Documentation

◆ cleanup()

void Query_result_union::cleanup ( THD * )

inlineoverridevirtual

Cleanup after this execution.

Completes the execution and resets object before next execution of a prepared statement/stored procedure.

Reimplemented from Query_result.

◆ create_result_table()

bool Query_result_union::create_result_table	(	THD *	thd_arg,
		const mem_root_deque< Item * > &	column_types,
		bool	is_union_distinct,
		ulonglong	options,
		const char *	table_alias,
		bool	bit_fields_as_long,
		bool	create_table
	)

Create a temporary table to store the result of a query expression (used, among others, when materializing a UNION DISTINCT).

Parameters

thd_arg	thread handle
column_types	a list of items used to define columns of the temporary table
is_union_distinct	if set, the temporary table will eliminate duplicates on insert
options	create options
table_alias	name of the temporary table
bit_fields_as_long	convert bit fields to ulonglong
create_table	If false, a table handler will not be created when creating the result table.

Create a temporary table that is used to store the result of a UNION, derived table, or a materialized cursor.

Returns: false if table created, true if error

◆ flush()

bool Query_result_union::flush ( )

virtual

Reimplemented in Query_result_union_direct.

◆ postponed_prepare()

virtual bool Query_result_union::postponed_prepare	(	THD *thd]	[[maybe_unused],
		const mem_root_deque< Item * > &types]	[[maybe_unused]
	)

inlinevirtual

Do prepare() if preparation has been postponed until column type information is computed (used by Query_result_union_direct).

Parameters

thd	Thread handle
types	Column types

Returns: false on success, true on failure

◆ prepare()

bool Query_result_union::prepare	(	THD *	,
		const mem_root_deque< Item * > &	,
		Query_expression *	u
	)

overridevirtual

Perform preparation specific to the query expression or DML statement.

Returns: false if success, true if error

Reimplemented from Query_result.

◆ reset()

bool Query_result_union::reset ( void )

overridevirtual

Reset and empty the temporary table that stores the materialized query result.

Note: The cleanup performed here is exactly the same as for the two temp tables of JOIN - exec_tmp_table_[1 | 2].

Reimplemented from Query_result.

◆ row_count()

const ha_rows* Query_result_union::row_count ( ) const

inlineoverridevirtual

Returns: Pointer to count of rows retained by this result.

Reimplemented from Query_result.

◆ send_data()

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

overridevirtual

Implements Query_result.

◆ send_eof()

bool Query_result_union::send_eof ( THD * thd )

overridevirtual

Implements Query_result.

Friends And Related Function Documentation

◆ TABLE_LIST::create_materialized_table

bool TABLE_LIST::create_materialized_table ( THD * thd )

friend

◆ TABLE_LIST::optimize_derived

bool TABLE_LIST::optimize_derived ( THD * thd )

friend

Member Data Documentation

◆ m_rows_in_table

ha_rows Query_result_union::m_rows_in_table

protected

Count of rows successfully stored in tmp table.

◆ table

TABLE* Query_result_union::table

◆ tmp_table_param

Temp_table_param Query_result_union::tmp_table_param

protected

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

sql/sql_union.h
sql/sql_union.cc

Public Member Functions

Public Attributes

Protected Attributes

Friends

Constructor & Destructor Documentation

◆ Query_result_union()

Member Function Documentation

◆ cleanup()

◆ create_result_table()

◆ flush()

◆ postponed_prepare()

◆ prepare()

◆ reset()

◆ row_count()

◆ send_data()

◆ send_eof()

Friends And Related Function Documentation

◆ TABLE_LIST::create_materialized_table

◆ TABLE_LIST::optimize_derived

Member Data Documentation

◆ m_rows_in_table

◆ table

◆ tmp_table_param