Table_function Class Reference

Class representing a table function. More...

#include <table_function.h>

Inheritance diagram for Table_function:

Public Member Functions
	Table_function ()
virtual	~Table_function ()=default
bool	create_result_table (THD *thd, ulonglong options, const char *table_alias)
	Create, but not instantiate the result table. More...
bool	write_row ()
	Write current record to the result table and handle overflow to disk. More...
Field *	get_field (uint i)
	Returns a field with given index. More...
void	empty_table ()
	Delete all rows in the table. More...
void	default_row ()
	Set the default row. More...
virtual bool	init ()=0
	Initialize table function. More...
virtual bool	init_args ()
	Initialize table function after the result table has been created. More...
virtual bool	fill_result_table ()=0
	Execute the table function - fill the result table. More...
virtual const char *	func_name () const =0
	Returns table function's name. More...
virtual table_map	used_tables () const
	Return table_map of tables used by the function. More...
virtual bool	print (const THD *thd, String *str, enum_query_type query_type) const =0
	Print table function. More...
void	cleanup ()
	Clean up table function after one execution. More...
void	destroy ()
	Destroy table function object after all executions are complete. More...
virtual bool	walk (Item_processor processor, enum_walk walk, uchar *arg)=0
void	fix_after_pullout (Query_block *parent_query_block, Query_block *removed_query_block)
	Fix after tables have been moved from one query_block level to the parent level, e.g by semijoin conversion. More...

Protected Attributes
TABLE *	table
	Table function's result table. More...
bool	inited
	Whether the table function was already initialized. More...

Private Member Functions
virtual List< Create_field > *	get_field_list ()=0
	Get the list of fields to create the result table. More...
virtual bool	do_init_args ()=0
	Initialize table function's arguments. More...
virtual void	do_cleanup ()
virtual void	do_fix_after_pullout (Query_block *parent_query_block, Query_block *removed_query_block)=0

Friends
bool	Table_ref::setup_table_function (THD *thd)

Detailed Description

Class representing a table function.

Constructor & Destructor Documentation

Table_function()

Table_function::Table_function ( )

inlineexplicit

~Table_function()

virtual Table_function::~Table_function ( )

virtualdefault

Member Function Documentation

cleanup()

void Table_function::cleanup ( void  )

inline

Clean up table function after one execution.

create_result_table()

bool Table_function::create_result_table	(	THD *	thd,
		ulonglong	options,
		const char *	table_alias
	)

Create, but not instantiate the result table.

Parameters

thd	thread handler
options	options to create table
table_alias	table's alias

Returns

true on error false on success

default_row()

void Table_function::default_row ( )

inline

Set the default row.

destroy()

void Table_function::destroy ( )

inline

Destroy table function object after all executions are complete.

do_cleanup()

virtual void Table_function::do_cleanup ( )

inlineprivatevirtual

Reimplemented in Table_function_json.

do_fix_after_pullout()

virtual void Table_function::do_fix_after_pullout ( Query_block *  parent_query_block, Query_block *  removed_query_block  )

privatepure virtual

Implemented in Table_function_json.

do_init_args()

virtual bool Table_function::do_init_args ( )

privatepure virtual

Initialize table function's arguments.

Returns

true on error false on success

Implemented in Table_function_json.

empty_table()

void Table_function::empty_table

(

)

Delete all rows in the table.

fill_result_table()

virtual bool Table_function::fill_result_table ( )

pure virtual

Execute the table function - fill the result table.

Returns

true on error false on success

Implemented in Table_function_json.

fix_after_pullout()

void Table_function::fix_after_pullout	(	Query_block *	parent_query_block,
		Query_block *	removed_query_block
	)

Fix after tables have been moved from one query_block level to the parent level, e.g by semijoin conversion.

Parameters

parent_query_block	query_block that tables are moved to.
removed_query_block	query_block that tables are moved away from, child of parent_query_block.

func_name()

virtual const char * Table_function::func_name ( ) const

pure virtual

Returns table function's name.

Implemented in Table_function_json.

get_field()

Field * Table_function::get_field ( uint  i )

inline

Returns a field with given index.

Parameters

i	field's index

Returns

field with given index

get_field_list()

virtual List< Create_field > * Table_function::get_field_list ( )

privatepure virtual

Get the list of fields to create the result table.

Implemented in Table_function_json.

init()

virtual bool Table_function::init ( )

pure virtual

Initialize table function.

Returns

true on error false on success

Implemented in Table_function_json.

init_args()

bool Table_function::init_args ( )

virtual

Initialize table function after the result table has been created.

Returns

true on error false on success

print()

virtual bool Table_function::print ( const THD *  thd, String *  str, enum_query_type  query_type  ) const

pure virtual

Print table function.

Parameters

thd	thread handler
str	string to print to
query_type	type of the query

Returns

true on error false on success

Implemented in Table_function_json.

used_tables()

virtual table_map Table_function::used_tables ( ) const

inlinevirtual

Return table_map of tables used by the function.

Reimplemented in Table_function_json.

walk()

virtual bool Table_function::walk ( Item_processor  processor, enum_walk  walk, uchar *  arg  )

pure virtual

Implemented in Table_function_json.

write_row()

bool Table_function::write_row

(

)

Write current record to the result table and handle overflow to disk.

Returns

true on error false on success

Friends And Related Function Documentation

Table_ref::setup_table_function

bool Table_ref::setup_table_function ( THD *  thd )

friend

Member Data Documentation

inited

bool Table_function::inited

protected

Whether the table function was already initialized.

table

TABLE* Table_function::table

protected

Table function's result table.

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

• sql/table_function.h
• sql/table_function.cc