This class is effectively dead. More...

Inheritance diagram for Query_result_union_direct:

Public Member Functions
	Query_result_union_direct (Query_result result, Query_block last_query_block)

bool	change_query_result (THD thd, Query_result new_result) override
	Replace the current query result with new_result and prepare it. More...

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

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

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

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

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

bool	send_eof (THD *) override

bool	flush () override

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

void	abort_result_set (THD *thd) override

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

Public Member Functions inherited from Query_result_union
	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...

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

bool	send_eof (THD *thd) override

void	cleanup () 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, Query_term_set_op op=nullptr)
	Create a temporary table to store the result of a query expression (used, among others, when materializing a UNION DISTINCT). More...

uint	get_hidden_field_count () const

bool	skip_create_table () const

void	set_limit (ha_rows limit_rows) override
	Set an effective LIMIT for the number of rows coming out of a materialized temporary table used for implementing INTERSECT or EXCEPT: informs TableScanIterator::TableScanIterator how many rows to read from the materialized table. More...

Public Member Functions inherited from Query_result_interceptor
	Query_result_interceptor ()

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	need_explain_interceptor () const

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

virtual Server_side_cursor *	cursor () const

Private Attributes
Query_result *	result
	Result object that receives all rows. More...

bool	optimized
	Wrapped result is optimized. More...

bool	execution_started
	Wrapped result has started execution. More...

Additional Inherited Members
Public Attributes inherited from Query_result_union
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 inherited from Query_result_union
Temp_table_param	tmp_table_param

Protected Attributes inherited from Query_result
Query_expression *	unit

Detailed Description

This class is effectively dead.

It was used for non-DISTINCT UNIONs in the pre-iterator executor. Now it exists only as a shell for certain setup tasks, and should be removed.

Constructor & Destructor Documentation

◆ Query_result_union_direct()

Query_result_union_direct::Query_result_union_direct	(	Query_result *	result,
		Query_block *	last_query_block
	)

inline

Member Function Documentation

◆ abort_result_set()

void Query_result_union_direct::abort_result_set ( THD * thd )

inlineoverridevirtual

Reimplemented from Query_result.

◆ change_query_result()

bool Query_result_union_direct::change_query_result	(	THD *	thd,
		Query_result *	new_result
	)

overridevirtual

Replace the current query result with new_result and prepare it.

Parameters

thd	Thread handle
new_result	New query result

Returns: false if success, true if error

Reimplemented from Query_result.

◆ check_supports_cursor()

bool Query_result_union_direct::check_supports_cursor ( ) const

inlineoverridevirtual

Check if this query result set supports cursors.

Returns: false if success, true if error

Reimplemented from Query_result.

◆ cleanup()

void Query_result_union_direct::cleanup ( void )

inlineoverridevirtual

Cleanup after this execution.

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

Reimplemented from Query_result.

◆ field_count()

uint Query_result_union_direct::field_count ( const mem_root_deque< Item * > & ) const

inlineoverridevirtual

Reimplemented from Query_result_interceptor.

◆ flush()

bool Query_result_union_direct::flush ( )

inlineoverridevirtual

Reimplemented from Query_result_union.

◆ postponed_prepare()

bool Query_result_union_direct::postponed_prepare	(	THD *	thd,
		const mem_root_deque< Item * > &	types
	)

overridevirtual

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

Reimplemented from Query_result_union.

◆ send_data()

bool Query_result_union_direct::send_data	(	THD *	,
		const mem_root_deque< Item * > &
	)

inlineoverridevirtual

Implements Query_result.

◆ send_eof()

bool Query_result_union_direct::send_eof ( THD * )

inlineoverridevirtual

Implements Query_result.

◆ send_result_set_metadata()

bool Query_result_union_direct::send_result_set_metadata	(	THD *	,
		const mem_root_deque< Item * > &	,
		uint
	)

inlineoverridevirtual

Reimplemented from Query_result_interceptor.

◆ start_execution()

bool Query_result_union_direct::start_execution ( THD * )

inlineoverridevirtual

Prepare for execution of the query expression or DML statement.

Generally, this will have an implementation only for outer-most Query_block objects, such as data change statements (for preparation of the target table(s)) or dump statements (for preparation of target file).

Returns: false if success, true if error

Reimplemented from Query_result.

Member Data Documentation

◆ execution_started

bool Query_result_union_direct::execution_started

private

Wrapped result has started execution.

◆ optimized

bool Query_result_union_direct::optimized

private

Wrapped result is optimized.

◆ result

Query_result* Query_result_union_direct::result

private

Result object that receives all rows.

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

sql/sql_union.cc

Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Query_result_union_direct()

Member Function Documentation

◆ abort_result_set()

◆ change_query_result()

◆ check_supports_cursor()

◆ cleanup()

◆ field_count()

◆ flush()

◆ postponed_prepare()

◆ send_data()

◆ send_eof()

◆ send_result_set_metadata()

◆ start_execution()

Member Data Documentation

◆ execution_started

◆ optimized

◆ result