partition_info Class Reference

#include <partition_info.h>

Public Types
enum	enum_can_prune { PRUNE_NO = 0 , PRUNE_DEFAULTS , PRUNE_YES }
	PRUNE_NO - Unable to prune. More...

Public Member Functions
	partition_info ()
partition_info *	get_clone (THD *thd, bool reset=false)
partition_info *	get_full_clone (THD *thd)
bool	set_named_partition_bitmap (const char *part_name, size_t length)
	Mark named [sub]partition to be used/locked. More...
bool	set_partition_bitmaps (Table_ref *table_list)
	Set read/lock_partitions bitmap over non pruned partitions. More...
bool	set_read_partitions (List< String > *partition_names)
	Prune away partitions not mentioned in the PARTITION () clause, if used. More...
bool	is_sub_partitioned () const
uint	get_tot_partitions () const
bool	set_up_defaults_for_partitioning (Partition_handler *part_handler, HA_CREATE_INFO *info, uint start_no)
char *	find_duplicate_field ()
const char *	find_duplicate_name ()
bool	check_engine_mix (handlerton *engine_type, bool default_engine)
bool	check_range_constants (THD *thd)
bool	check_list_constants (THD *thd)
bool	check_partition_info (THD *thd, handlerton **eng_type, handler *file, HA_CREATE_INFO *info, bool check_partition_function)
void	print_no_partition_found (THD *thd, TABLE *table)
void	print_debug (const char *str, uint *)
Item *	get_column_item (Item *item, Field *field)
	Get column item with a proper character set according to the field. More...
bool	fix_partition_values (part_elem_value *val, partition_element *part_elem, uint part_id)
	This function handles the case of function-based partitioning. More...
bool	fix_column_value_functions (THD *thd, part_elem_value *val, uint part_id)
	Evaluate VALUES functions for column list values. More...
bool	fix_parser_data (THD *thd)
	Fix partition data from parser. More...
bool	set_part_expr (char *start_token, Item *item_ptr, char *end_token, bool is_subpart)
bool	set_up_charset_field_preps ()
bool	check_partition_field_length ()
void	set_show_version_string (String *packet)
partition_element *	get_part_elem (const char *partition_name, uint32 *part_id)
	Get part_elem and part_id from partition name. More...
void	report_part_expr_error (bool use_subpart_expr)
	Check what kind of error to report. More...
bool	set_used_partition (THD *thd, const mem_root_deque< Item * > &fields, const mem_root_deque< Item * > &values, COPY_INFO &info, bool copy_default_values, MY_BITMAP *used_partitions)
	Mark the partition, the record belongs to, as used. More...
bool	can_prune_insert (THD *thd, enum_duplicates duplic, COPY_INFO &update, const mem_root_deque< Item * > &update_fields, const mem_root_deque< Item * > &fields, bool empty_values, enum_can_prune *can_prune_partitions, bool *prune_needs_default_values, MY_BITMAP *used_partitions)
	Checks if possible to do prune partitions on insert. More...
bool	has_same_partitioning (partition_info *new_part_info)
	Check if the new part_info has the same partitioning. More...
bool	is_partition_used (uint part_id) const
bool	is_partition_locked (uint part_id) const
uint	num_partitions_used ()
uint	get_first_used_partition () const
uint	get_next_used_partition (uint part_id) const
bool	same_key_column_order (List< Create_field > *create_list)
	Check if the partitioning columns are in the same order as the given list. More...
bool	init_partition_bitmap (MY_BITMAP *bitmap, MEM_ROOT *mem_root)
	Allocate memory for one partitions bitmap and initialize it. More...

Static Public Member Functions
static bool	compare_column_values (const part_column_list_val *a, const part_column_list_val *b)

Public Attributes
List< partition_element >	partitions
List< partition_element >	temp_partitions
List< char >	part_field_list
List< char >	subpart_field_list
get_part_id_func	get_partition_id
get_part_id_func	get_part_partition_id
get_subpart_id_func	get_subpartition_id
get_part_id_func	get_part_partition_id_charset
get_subpart_id_func	get_subpartition_id_charset
Field **	part_field_array
Field **	subpart_field_array
Field **	part_charset_field_array
Field **	subpart_charset_field_array
Field **	full_part_field_array
MY_BITMAP	full_part_field_set
uchar **	part_field_buffers
uchar **	subpart_field_buffers
uchar **	restore_part_field_ptrs
uchar **	restore_subpart_field_ptrs
Item *	part_expr
Item *	subpart_expr
Item *	item_list
MY_BITMAP	read_partitions
MY_BITMAP	lock_partitions
bool	bitmaps_are_initialized
union {
longlong *   range_int_array
LIST_PART_ENTRY *   list_array
part_column_list_val *   range_col_array
part_column_list_val *   list_col_array
};
get_partitions_in_range_iter	get_part_iter_for_interval
get_partitions_in_range_iter	get_subpart_iter_for_interval
longlong	err_value
char *	part_func_string
	Partition expression as string. More...
char *	subpart_func_string
	Subpartition expression as string. More...
uint	num_columns
TABLE *	table
Key_map	all_fields_in_PF
Key_map	all_fields_in_PPF
Key_map	all_fields_in_SPF
Key_map	some_fields_in_PF
handlerton *	default_engine_type
partition_type	part_type
partition_type	subpart_type
size_t	part_func_len
size_t	subpart_func_len
uint	num_parts
uint	num_subparts
uint	num_list_values
uint	num_part_fields
uint	num_subpart_fields
uint	num_full_part_fields
uint	has_null_part_id
uint16	linear_hash_mask
enum_key_algorithm	key_algorithm
bool	use_default_partitions
bool	use_default_num_partitions
bool	use_default_subpartitions
bool	use_default_num_subpartitions
bool	default_partitions_setup
bool	defined_max_value
bool	list_of_part_fields
bool	list_of_subpart_fields
bool	linear_hash_ind
bool	fixed
bool	is_auto_partitioned
bool	has_null_value
bool	column_list
bool	is_pruning_completed
	True if pruning has been completed and can not be pruned any further, even if there are subqueries or stored programs in the condition. More...

Private Member Functions
bool	set_up_default_partitions (Partition_handler *part_handler, HA_CREATE_INFO *info, uint start_no)
bool	set_up_default_subpartitions (Partition_handler *part_handler, HA_CREATE_INFO *info)
char *	create_default_partition_names (uint num_parts, uint start_no)
char *	create_default_subpartition_name (uint subpart_no, const char *part_name)
bool	add_named_partition (const char *part_name, size_t length)
	Mark named [sub]partition to be used/locked. More...
bool	is_fields_in_part_expr (const mem_root_deque< Item * > &fields)
	Check if fields are in the partitioning expression. More...
bool	is_full_part_expr_in_fields (const mem_root_deque< Item * > &fields)
	Check if all partitioning fields are included. More...

Member Enumeration Documentation

enum_can_prune

enum partition_info::enum_can_prune

PRUNE_NO - Unable to prune.

PRUNE_DEFAULTS - Partitioning field is only set to DEFAULT values, only need to check pruning for one row where the DEFAULTS values are set. PRUNE_YES - Pruning is possible, calculate the used partition set by evaluate the partition_id on row by row basis.

Enumerator
PRUNE_NO
PRUNE_DEFAULTS
PRUNE_YES

Constructor & Destructor Documentation

partition_info()

partition_info::partition_info ( )

inline

Member Function Documentation

add_named_partition()

bool partition_info::add_named_partition ( const char *  part_name, size_t  length  )

private

Mark named [sub]partition to be used/locked.

Parameters

part_name	Partition name to match.
length	Partition name length.

Returns

Success if partition found

Return values

true	Partition found
false	Partition not found

can_prune_insert()

bool partition_info::can_prune_insert	(	THD *	thd,
		enum_duplicates	duplic,
		COPY_INFO &	update,
		const mem_root_deque< Item * > &	update_fields,
		const mem_root_deque< Item * > &	fields,
		bool	empty_values,
		enum_can_prune *	can_prune_partitions,
		bool *	prune_needs_default_values,
		MY_BITMAP *	used_partitions
	)

Checks if possible to do prune partitions on insert.

Parameters

	thd	Thread context
	duplic	How to handle duplicates
	update	In case of ON DUPLICATE UPDATE, default function fields
	update_fields	In case of ON DUPLICATE UPDATE, which fields to update
	fields	Listed fields
	empty_values	True if values is empty (only defaults)
[out]	prune_needs_default_values	Set on return if copying of default values is needed
[out]	can_prune_partitions	Enum showing if possible to prune
[in,out]	used_partitions	If possible to prune the bitmap is initialized and cleared

Returns

Operation status

Return values

false	Success
true	Failure

check_engine_mix()

bool partition_info::check_engine_mix	(	handlerton *	engine_type,
		bool	default_engine
	)

check_list_constants()

bool partition_info::check_list_constants

(

THD *

thd

)

check_partition_field_length()

bool partition_info::check_partition_field_length

(

)

check_partition_info()

bool partition_info::check_partition_info	(	THD *	thd,
		handlerton **	eng_type,
		handler *	file,
		HA_CREATE_INFO *	info,
		bool	check_partition_function
	)

check_range_constants()

bool partition_info::check_range_constants

(

THD *

thd

)

compare_column_values()

bool partition_info::compare_column_values ( const part_column_list_val *  a, const part_column_list_val *  b  )

static

create_default_partition_names()

char * partition_info::create_default_partition_names ( uint  num_parts, uint  start_no  )

private

create_default_subpartition_name()

char * partition_info::create_default_subpartition_name ( uint  subpart_no, const char *  part_name  )

private

find_duplicate_field()

char * partition_info::find_duplicate_field

(

)

find_duplicate_name()

const char * partition_info::find_duplicate_name

(

)

fix_column_value_functions()

bool partition_info::fix_column_value_functions	(	THD *	thd,
		part_elem_value *	val,
		uint	part_id
	)

Evaluate VALUES functions for column list values.

Parameters

thd	Thread object
val	List of column values
part_id	Partition id we are fixing

Returns

Operation status

Return values

true	Error
false	Success

Note

Fix column VALUES and store in memory array adapted to the data type.

fix_parser_data()

bool partition_info::fix_parser_data

(

THD *

thd

)

Fix partition data from parser.

The parser generates generic data structures, we need to set them up as the rest of the code expects to find them. This is in reality part of the syntax check of the parser code.

It is necessary to call this function in the case of a CREATE TABLE statement, in this case we do it early in the check_partition_info function.

It is necessary to call this function for ALTER TABLE where we assign a completely new partition structure, in this case we do it in prep_alter_part_table after discovering that the partition structure is entirely redefined.

It's necessary to call this method also for ALTER TABLE ADD/REORGANIZE of partitions, in this we call it in prep_alter_part_table after making some initial checks but before going deep to check the partition info, we also assign the column_list variable before calling this function here.

Finally we also call it immediately after returning from parsing the partitioning text found in the frm file.

This function mainly fixes the VALUES parts, these are handled differently whether or not we use column list partitioning. Since the parser doesn't know which we are using we need to set-up the old data structures after the parser is complete when we know if what type of partitioning the base table is using.

For column lists we will handle this in the fix_column_value_function. For column lists it is sufficient to verify that the number of columns and number of elements are in synch with each other. So only partitioning using functions need to be set-up to their data structures.

Parameters

thd	Thread object

Returns

Operation status

Return values

true	Failure
false	Success

fix_partition_values()

bool partition_info::fix_partition_values	(	part_elem_value *	val,
		partition_element *	part_elem,
		uint	part_id
	)

This function handles the case of function-based partitioning.

It fixes some data structures created in the parser and puts them in the format required by the rest of the partitioning code.

Parameters

val	Array of one value
part_elem	The partition instance
part_id	Id of partition instance

Returns

Operation status

Return values

true	Failure
false	Success

get_clone()

partition_info * partition_info::get_clone	(	THD *	thd,
		bool	reset = false
	)

get_column_item()

Item * partition_info::get_column_item	(	Item *	item,
		Field *	field
	)

Get column item with a proper character set according to the field.

Parameters

item	Item object to start with
field	Field for which the item will be compared to

Returns

Column item

Return values

NULL	Error
item	Returned item

get_first_used_partition()

uint partition_info::get_first_used_partition ( ) const

inline

get_full_clone()

partition_info * partition_info::get_full_clone

(

THD *

thd

)

get_next_used_partition()

uint partition_info::get_next_used_partition ( uint  part_id ) const

inline

get_part_elem()

partition_element * partition_info::get_part_elem	(	const char *	partition_name,
		uint32 *	part_id
	)

Get part_elem and part_id from partition name.

Parameters

	partition_name	Name of partition to search for.
[out]	part_id	Id of found partition or NOT_A_PARTITION_ID.

Return values

Pointer

to part_elem of [sub]partition, if not found NULL

Note

Since names of partitions AND subpartitions must be unique, this function searches both partitions and subpartitions and if name of a partition is given for a subpartitioned table, part_elem will be the partition, but part_id will be NOT_A_PARTITION_ID and file_name not set.

get_tot_partitions()

uint partition_info::get_tot_partitions ( ) const

inline

has_same_partitioning()

bool partition_info::has_same_partitioning

(

partition_info *

new_part_info

)

Check if the new part_info has the same partitioning.

Parameters

new_part_info

New partition definition to compare with.

Returns

True if not considered to have changed the partitioning.

Return values

true	Allowed change (only .frm change, compatible distribution).
false	Different partitioning, will need redistribution of rows.

Note

Currently only used to allow changing from non-set key_algorithm to a specified key_algorithm, to avoid rebuild when upgrading from 5.1 of such partitioned tables using numeric columns in the partitioning expression. For more info see bug#14521864. Does not check if columns etc has changed, i.e. only for alter_info->flags == ALTER_PARTITION.

init_partition_bitmap()

bool partition_info::init_partition_bitmap	(	MY_BITMAP *	bitmap,
		MEM_ROOT *	mem_root
	)

Allocate memory for one partitions bitmap and initialize it.

Parameters

bitmap	Bitmap instance to initialize.
mem_root	Memory root to use for bitmap buffer allocation.

Return values

true	Memory allocation failure
false	Success

is_fields_in_part_expr()

bool partition_info::is_fields_in_part_expr ( const mem_root_deque< Item * > &  fields )

private

Check if fields are in the partitioning expression.

Parameters

fields

List of Items (fields)

Returns

True if any field in the fields list is used by a partitioning expr.

Return values

true	At least one field in the field list is found.
false	No field is within any partitioning expression.

is_full_part_expr_in_fields()

bool partition_info::is_full_part_expr_in_fields ( const mem_root_deque< Item * > &  fields )

private

Check if all partitioning fields are included.

is_partition_locked()

bool partition_info::is_partition_locked ( uint  part_id ) const

inline

is_partition_used()

bool partition_info::is_partition_used ( uint  part_id ) const

inline

is_sub_partitioned()

bool partition_info::is_sub_partitioned ( ) const

inline

num_partitions_used()

uint partition_info::num_partitions_used ( )

inline

print_debug()

void partition_info::print_debug	(	const char *	str,
		uint *	value
	)

print_no_partition_found()

void partition_info::print_no_partition_found	(	THD *	thd,
		TABLE *	table
	)

report_part_expr_error()

void partition_info::report_part_expr_error

(

bool

use_subpart_expr

)

Check what kind of error to report.

Parameters

use_subpart_expr

Use the subpart_expr instead of part_expr

same_key_column_order()

bool partition_info::same_key_column_order

(

List< Create_field > *

create_list

)

Check if the partitioning columns are in the same order as the given list.

Used to see if INPLACE alter can be allowed or not. If the order is different then the rows must be redistributed for KEY [sub]partitioning.

Parameters

[in]

create_list

Column list after ALTER TABLE.

Returns

true is same order as before ALTER TABLE, else false.

set_named_partition_bitmap()

bool partition_info::set_named_partition_bitmap	(	const char *	part_name,
		size_t	length
	)

Mark named [sub]partition to be used/locked.

set_part_expr()

bool partition_info::set_part_expr	(	char *	start_token,
		Item *	item_ptr,
		char *	end_token,
		bool	is_subpart
	)

set_partition_bitmaps()

bool partition_info::set_partition_bitmaps

(

Table_ref *

table_list

)

Set read/lock_partitions bitmap over non pruned partitions.

Parameters

table_list

Possible Table_ref which can contain list of partition names to query

Returns

Operation status

Return values

false	OK
true	Failed to allocate memory for bitmap or list of partitions did not match

Note

OK to call multiple times without the need for free_bitmaps.

set_read_partitions()

bool partition_info::set_read_partitions

(

List< String > *

partition_names

)

Prune away partitions not mentioned in the PARTITION () clause, if used.

Returns

Operation status

Return values

false	Success
true	Failure

set_show_version_string()

void partition_info::set_show_version_string

(

String *

packet

)

set_up_charset_field_preps()

bool partition_info::set_up_charset_field_preps

(

)

set_up_default_partitions()

bool partition_info::set_up_default_partitions ( Partition_handler *  part_handler, HA_CREATE_INFO *  info, uint  start_no  )

private

set_up_default_subpartitions()

bool partition_info::set_up_default_subpartitions ( Partition_handler *  part_handler, HA_CREATE_INFO *  info  )

private

set_up_defaults_for_partitioning()

bool partition_info::set_up_defaults_for_partitioning	(	Partition_handler *	part_handler,
		HA_CREATE_INFO *	info,
		uint	start_no
	)

set_used_partition()

bool partition_info::set_used_partition	(	THD *	thd,
		const mem_root_deque< Item * > &	fields,
		const mem_root_deque< Item * > &	values,
		COPY_INFO &	info,
		bool	copy_default_values,
		MY_BITMAP *	used_partitions
	)

Mark the partition, the record belongs to, as used.

Parameters

thd	Thread handler
fields	Fields to set
values	Values to use
info	COPY_INFO used for default values handling
copy_default_values	True if we should copy default values
used_partitions	Bitmap to set

Returns

Operational status

Return values

false	Success
true	Failure A return value of 'true' may indicate conversion error, so caller must check thd->is_error().

Member Data Documentation

union { ... } partition_info::@154

all_fields_in_PF

Key_map partition_info::all_fields_in_PF

all_fields_in_PPF

Key_map partition_info::all_fields_in_PPF

all_fields_in_SPF

Key_map partition_info::all_fields_in_SPF

bitmaps_are_initialized

bool partition_info::bitmaps_are_initialized

column_list

bool partition_info::column_list

default_engine_type

handlerton* partition_info::default_engine_type

default_partitions_setup

bool partition_info::default_partitions_setup

defined_max_value

bool partition_info::defined_max_value

err_value

longlong partition_info::err_value

fixed

bool partition_info::fixed

full_part_field_array

Field** partition_info::full_part_field_array

full_part_field_set

MY_BITMAP partition_info::full_part_field_set

get_part_iter_for_interval

get_partitions_in_range_iter partition_info::get_part_iter_for_interval

get_part_partition_id

get_part_id_func partition_info::get_part_partition_id

get_part_partition_id_charset

get_part_id_func partition_info::get_part_partition_id_charset

get_partition_id

get_part_id_func partition_info::get_partition_id

get_subpart_iter_for_interval

get_partitions_in_range_iter partition_info::get_subpart_iter_for_interval

get_subpartition_id

get_subpart_id_func partition_info::get_subpartition_id

get_subpartition_id_charset

get_subpart_id_func partition_info::get_subpartition_id_charset

has_null_part_id

uint partition_info::has_null_part_id

has_null_value

bool partition_info::has_null_value

is_auto_partitioned

bool partition_info::is_auto_partitioned

is_pruning_completed

bool partition_info::is_pruning_completed

True if pruning has been completed and can not be pruned any further, even if there are subqueries or stored programs in the condition.

Some times it is needed to run prune_partitions() a second time to prune read partitions after tables are locked, when subquery and stored functions might have been evaluated.

item_list

Item* partition_info::item_list

key_algorithm

enum_key_algorithm partition_info::key_algorithm

linear_hash_ind

bool partition_info::linear_hash_ind

linear_hash_mask

uint16 partition_info::linear_hash_mask

list_array

LIST_PART_ENTRY* partition_info::list_array

list_col_array

part_column_list_val* partition_info::list_col_array

list_of_part_fields

bool partition_info::list_of_part_fields

list_of_subpart_fields

bool partition_info::list_of_subpart_fields

lock_partitions

MY_BITMAP partition_info::lock_partitions

num_columns

uint partition_info::num_columns

num_full_part_fields

uint partition_info::num_full_part_fields

num_list_values

uint partition_info::num_list_values

num_part_fields

uint partition_info::num_part_fields

num_parts

uint partition_info::num_parts

num_subpart_fields

uint partition_info::num_subpart_fields

num_subparts

uint partition_info::num_subparts

part_charset_field_array

Field** partition_info::part_charset_field_array

part_expr

Item* partition_info::part_expr

part_field_array

Field** partition_info::part_field_array

part_field_buffers

uchar** partition_info::part_field_buffers

part_field_list

List<char> partition_info::part_field_list

part_func_len

size_t partition_info::part_func_len

part_func_string

char* partition_info::part_func_string

Partition expression as string.

part_type

partition_type partition_info::part_type

partitions

List<partition_element> partition_info::partitions

range_col_array

part_column_list_val* partition_info::range_col_array

range_int_array

longlong* partition_info::range_int_array

read_partitions

MY_BITMAP partition_info::read_partitions

restore_part_field_ptrs

uchar** partition_info::restore_part_field_ptrs

restore_subpart_field_ptrs

uchar** partition_info::restore_subpart_field_ptrs

some_fields_in_PF

Key_map partition_info::some_fields_in_PF

subpart_charset_field_array

Field** partition_info::subpart_charset_field_array

subpart_expr

Item* partition_info::subpart_expr

subpart_field_array

Field** partition_info::subpart_field_array

subpart_field_buffers

uchar** partition_info::subpart_field_buffers

subpart_field_list

List<char> partition_info::subpart_field_list

subpart_func_len

size_t partition_info::subpart_func_len

subpart_func_string

char* partition_info::subpart_func_string

Subpartition expression as string.

subpart_type

partition_type partition_info::subpart_type

table

TABLE* partition_info::table

temp_partitions

List<partition_element> partition_info::temp_partitions

use_default_num_partitions

bool partition_info::use_default_num_partitions

use_default_num_subpartitions

bool partition_info::use_default_num_subpartitions

use_default_partitions

bool partition_info::use_default_partitions

use_default_subpartitions

bool partition_info::use_default_subpartitions

---

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

• sql/partition_info.h
• sql/partition_info.cc