#include <abstract_query_plan.h>

Inheritance diagram for AQP::Table_access:

Collaboration diagram for AQP::Table_access:

Public Member Functions
const Join_plan *	get_join_plan () const
enum_access_type	get_access_type () const
const char *	get_other_access_reason () const
enum_join_type	get_join_type (const Table_access *parent) const
uint	get_no_of_key_fields () const
const Item *	get_key_field (uint field_no) const
const KEY_PART_INFO *	get_key_part_info (uint field_no) const
uint	get_access_no () const
int	get_index_no () const
TABLE *	get_table () const
double	get_fanout () const
Item_equal *	get_item_equal (const Item_field *field_item) const
void	dbug_print () const
bool	uses_join_cache () const
bool	filesort_before_join () const

Friends
class	Join_plan
bool	equal (const Table_access , const Table_access )

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

This class represents an access operation on a table, such as a table scan, or a scan or lookup via an index. A Table_access object is always owned by a Join_plan object, such that the life time of the Table_access object ends when the life time of the owning Join_plan object ends.

Definition at line 168 of file abstract_query_plan.h.

Member Function Documentation

void AQP::Table_access::dbug_print ( ) const

Write an entry in the trace file about the contents of this object.

Definition at line 208 of file abstract_query_plan.cc.

bool AQP::Table_access::filesort_before_join ( ) const

Check if this table will be presorted to an intermediate record storage before it is joined with its siblings.

Table will be presorted before joining with child tables, if: 1) This is the first non-const table 2) There are more tables to be joined 3) It is not already decide to write entire join result to temp. 4a) The GROUP BY is 'simple' and does not match an orderd index 4b) The ORDER BY is 'simple' and does not match an orderd index

A 'simple' order/group by contain only column references to the first non-const table

Definition at line 449 of file abstract_query_plan.cc.

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uint AQP::Table_access::get_access_no ( ) const

inline

Get the number of this Table_access within the enclosing Join_plan. (This number will be in the range 0 to Join_plan::get_access_count() - 1.)

Definition at line 297 of file abstract_query_plan.h.

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enum_access_type AQP::Table_access::get_access_type ( ) const

inline

Get the type of this operation.

Definition at line 261 of file abstract_query_plan.h.

int AQP::Table_access::get_index_no ( ) const

inline

Returns: The number of the index to use for this access operation ( or -1 for non-index operations).

Definition at line 285 of file abstract_query_plan.h.

Item_equal * AQP::Table_access::get_item_equal ( const Item_field * field_item ) const

Get the Item_equal's set relevant for the specified 'Item_field'

Definition at line 191 of file abstract_query_plan.cc.

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const Join_plan * AQP::Table_access::get_join_plan ( ) const

inline

Get the Join_plan that this Table_access belongs to.

Definition at line 255 of file abstract_query_plan.h.

enum_join_type AQP::Table_access::get_join_type ( const Table_access * predecessor ) const

Determine join type between this table access and some other table access that preceeds it in the join plan..

Fall Through: 'this' is a member in an outer join, but 'predecessor' may still be embedded in the same inner join as 'this'.

Definition at line 71 of file abstract_query_plan.cc.

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const Item * AQP::Table_access::get_key_field ( uint field_no ) const

Get the field_no'th key values for this operation. It is an error to call this method on an operation that is not an index lookup operation.

Definition at line 128 of file abstract_query_plan.cc.

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const KEY_PART_INFO * AQP::Table_access::get_key_part_info ( uint field_no ) const

Get the field_no'th KEY_PART_INFO for this operation. It is an error to call this method on an operation that is not an index lookup operation.

Definition at line 139 of file abstract_query_plan.cc.

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uint AQP::Table_access::get_no_of_key_fields ( ) const

Get the number of key values for this operation. It is an error to call this method on an operation that is not an index lookup operation.

Definition at line 113 of file abstract_query_plan.cc.

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const char * AQP::Table_access::get_other_access_reason ( ) const

inline

Get a description of the reason for getting access_type==AT_OTHER. To be used for informational messages.

Returns: A string that should be assumed to have the same life time as the Table_access object.

Definition at line 274 of file abstract_query_plan.h.

TABLE * AQP::Table_access::get_table ( ) const

Get the table that this operation accesses.

Definition at line 149 of file abstract_query_plan.cc.

bool AQP::Table_access::uses_join_cache ( ) const

Check if the results from this operation will joined with results from the next operation using a join buffer (instead of plain nested loop).

Returns: True if using a join buffer.

Definition at line 440 of file abstract_query_plan.cc.

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

sql/abstract_query_plan.h
sql/abstract_query_plan.cc

Public Member Functions

Friends

Additional Inherited Members

Detailed Description

Member Function Documentation