JOIN_CACHE Class Reference

Inheritance diagram for JOIN_CACHE:

Collaboration diagram for JOIN_CACHE:

Public Types
enum	{ ALG_NONE = 0, ALG_BNL = 1, ALG_BKA = 2, ALG_BKA_UNIQUE = 4 }
Public Types inherited from QEP_operation
enum	enum_op_type { OT_CACHE, OT_TMP_TABLE }

Public Member Functions
virtual int	init ()=0
virtual bool	is_key_access ()
virtual void	reset_cache (bool for_writing)
	Reset the join buffer for reading/writing: default implementation.
virtual enum_nested_loop_state	put_record ()
virtual bool	get_record ()
virtual void	get_record_by_pos (uchar *rec_ptr)
virtual bool	get_match_flag_by_pos (uchar *rec_ptr)
virtual uchar *	get_curr_rec ()
virtual void	set_curr_rec_link (uchar *link)
virtual uchar *	get_curr_rec_link ()
enum_nested_loop_state	end_send ()
enum_nested_loop_state	join_records (bool skip_last)
enum_op_type	type ()
void	free ()
Public Member Functions inherited from QEP_operation
	QEP_operation (JOIN_TAB *tab)

Public Attributes
JOIN_CACHE *	prev_cache
JOIN_CACHE *	next_cache
Public Attributes inherited from QEP_operation
JOIN_TAB *	join_tab

Protected Member Functions
uint	offset_size (uint len)
ulong	get_offset (uint ofs_sz, uchar *ptr)
void	store_offset (uint ofs_sz, uchar *ptr, ulong ofs)
void	calc_record_fields ()
int	alloc_fields (uint external_fields)
void	create_flag_fields ()
void	create_remaining_fields (bool all_read_fields)
void	set_constants ()
bool	alloc_buffer ()
uint	get_size_of_rec_offset ()
uint	get_size_of_rec_length ()
uint	get_size_of_fld_offset ()
uchar *	get_rec_ref (uchar *ptr)
ulong	get_rec_length (uchar *ptr)
ulong	get_fld_offset (uchar *ptr)
void	store_rec_ref (uchar *ptr, uchar *ref)
void	store_rec_length (uchar *ptr, ulong len)
void	store_fld_offset (uchar *ptr, ulong ofs)
uint	write_record_data (uchar *link, bool *is_full)
virtual uint	aux_buffer_incr ()
virtual uint	aux_buffer_min_size () const
virtual ulong	rem_space ()
virtual bool	skip_record_if_match ()
int	read_some_record_fields ()
void	read_some_flag_fields ()
void	read_all_flag_fields_by_pos (uchar *rec_ptr)
uint	read_record_field (CACHE_FIELD *copy, bool last_record)
bool	read_referenced_field (CACHE_FIELD *copy, uchar *rec_ptr, uint *len)
bool	blob_data_is_in_rec_buff (uchar *rec_ptr)
virtual enum_nested_loop_state	join_matching_records (bool skip_last)=0
virtual enum_nested_loop_state	join_null_complements (bool skip_last)
virtual void	restore_last_record ()
bool	set_match_flag_if_none (JOIN_TAB *first_inner, uchar *rec_ptr)
enum_nested_loop_state	generate_full_extensions (uchar *rec_ptr)
virtual bool	check_match (uchar *rec_ptr)
bool	calc_check_only_first_match (const JOIN_TAB *t) const
virtual bool	put_record_in_cache ()

Protected Attributes
uint	length
JOIN *	join
uint	tables
uint	fields
uint	flag_fields
uint	blobs
uint	referenced_fields
uint	data_field_count
uint	data_field_ptr_count
CACHE_FIELD *	field_descr
CACHE_FIELD **	blob_ptr
bool	with_match_flag
bool	with_length
uint	pack_length
uint	pack_length_with_blob_ptrs
uchar *	buff
ulong	buff_size
ulong	aux_buff_size
uint	records
uchar *	pos
uchar *	end_pos
uchar *	curr_rec_pos
uchar *	last_rec_pos
bool	last_rec_blob_data_is_in_rec_buff
uchar *	curr_rec_link
bool	check_only_first_match

Friends
class	JOIN_CACHE_BNL
class	JOIN_CACHE_BKA
class	JOIN_CACHE_BKA_UNIQUE

Additional Inherited Members
Static Public Member Functions inherited from Sql_alloc
static void *	operator new (size_t size) throw ()
static void *	operator new[] (size_t size) throw ()
static void *	operator new[] (size_t size, MEM_ROOT *mem_root) throw ()
static void *	operator new (size_t size, MEM_ROOT *mem_root) throw ()
static void	operator delete (void *ptr, size_t size)
static void	operator delete (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, size_t size)

Detailed Description

Definition at line 89 of file sql_join_buffer.h.

Member Enumeration Documentation

anonymous enum

Bits describing cache's type

See Also

setup_join_buffering()

Definition at line 473 of file sql_join_buffer.h.

Member Function Documentation

virtual uint JOIN_CACHE::aux_buffer_min_size ( ) const

inlineprotectedvirtual

This method must determine the minimum size for the auxiliary buffer. If no auxiliary buffer is needed the function should return 0.

Reimplemented in JOIN_CACHE_BKA.

Definition at line 330 of file sql_join_buffer.h.

bool JOIN_CACHE::calc_check_only_first_match ( const JOIN_TAB *  t ) const

inlineprotected

Returns

whether we should check only the first match for this table

Definition at line 383 of file sql_join_buffer.h.

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enum_nested_loop_state JOIN_CACHE::end_send ( )

inlinevirtual

Finalize records sending.

Implements QEP_operation.

Definition at line 447 of file sql_join_buffer.h.

void JOIN_CACHE::free ( void  )

inlinevirtual

Internal state cleanup.

Reimplemented from QEP_operation.

Definition at line 453 of file sql_join_buffer.h.

virtual int JOIN_CACHE::init ( void  )

pure virtual

Initialize operation's internal state. Called once per query execution.

Reimplemented from QEP_operation.

Implemented in JOIN_CACHE_BKA_UNIQUE, JOIN_CACHE_BKA, and JOIN_CACHE_BNL.

virtual enum_nested_loop_state JOIN_CACHE::put_record ( )

inlinevirtual

Put a new record into the operation's buffer

Returns

return one of enum_nested_loop_state values.

Implements QEP_operation.

Definition at line 413 of file sql_join_buffer.h.

Member Data Documentation

bool JOIN_CACHE::check_only_first_match

protected

Cached value of calc_check_only_first_match(join_tab)

Definition at line 276 of file sql_join_buffer.h.

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

• sql/sql_join_buffer.h
• sql/sql_join_buffer.cc