QUICK_SELECT_I Class Reference

Inheritance diagram for QUICK_SELECT_I:

Collaboration diagram for QUICK_SELECT_I:

Public Types
enum	{   QS_TYPE_RANGE = 0, QS_TYPE_INDEX_MERGE = 1, QS_TYPE_RANGE_DESC = 2, QS_TYPE_FULLTEXT = 3,   QS_TYPE_ROR_INTERSECT = 4, QS_TYPE_ROR_UNION = 5, QS_TYPE_GROUP_MIN_MAX = 6 }

Public Member Functions
virtual int	init ()=0
virtual int	reset (void)=0
virtual int	get_next ()=0
virtual void	range_end ()
virtual bool	reverse_sorted () const =0
virtual bool	reverse_sort_possible () const =0
virtual bool	unique_key_range ()
virtual bool	clustered_pk_range ()
virtual void	need_sorted_output ()=0
virtual int	get_type ()=0
virtual int	init_ror_merged_scan (bool reuse_handler)
virtual void	save_last_pos ()
virtual void	add_keys_and_lengths (String *key_names, String *used_lengths)=0
virtual void	add_info_string (String *str)
virtual bool	is_keys_used (const MY_BITMAP *fields)
virtual bool	is_valid ()
virtual void	dbug_dump (int indent, bool verbose)=0
virtual QUICK_SELECT_I *	make_reverse (uint used_key_parts_arg)
virtual void	set_handler (handler *file_arg)

Public Attributes
ha_rows	records
double	read_time
TABLE *	head
uint	index
uint	max_used_key_length
uint	used_key_parts
uchar *	last_rowid
uchar *	record

Detailed Description

Definition at line 197 of file opt_range.h.

Member Function Documentation

virtual bool QUICK_SELECT_I::is_valid ( void  )

inlinevirtual

Simple sanity check that the quick select has been set up correctly. Function is overridden by quick selects that merge indices.

Reimplemented in QUICK_ROR_UNION_SELECT, QUICK_ROR_INTERSECT_SELECT, and QUICK_INDEX_MERGE_SELECT.

Definition at line 350 of file opt_range.h.

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virtual bool QUICK_SELECT_I::reverse_sort_possible ( ) const

pure virtual

Whether the range access method is capable of returning records in reverse order.

Implemented in QUICK_SELECT_DESC, QUICK_GROUP_MIN_MAX_SELECT, QUICK_ROR_UNION_SELECT, QUICK_ROR_INTERSECT_SELECT, QUICK_INDEX_MERGE_SELECT, and QUICK_RANGE_SELECT.

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virtual bool QUICK_SELECT_I::reverse_sorted ( ) const

pure virtual

Whether the range access method returns records in reverse order.

Implemented in QUICK_SELECT_DESC, QUICK_GROUP_MIN_MAX_SELECT, QUICK_ROR_UNION_SELECT, QUICK_ROR_INTERSECT_SELECT, QUICK_INDEX_MERGE_SELECT, and QUICK_RANGE_SELECT.

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

• sql/opt_range.h
• sql/opt_range.cc