Partition_share Class Reference

Partition specific Handler_share. More...

#include <partition_handler.h>

Inheritance diagram for Partition_share:

Public Member Functions
	Partition_share ()
	~Partition_share () override
bool	init_auto_inc_mutex (TABLE_SHARE *table_share)
	Initializes and sets auto_inc_mutex. More...
void	release_auto_inc_if_possible (THD *thd, TABLE_SHARE *table_share, const ulonglong next_insert_id, const ulonglong max_reserved)
	Release reserved auto increment values not used. More...
void	lock_auto_inc ()
	lock mutex protecting auto increment value next_auto_inc_val. More...
void	unlock_auto_inc ()
	unlock mutex protecting auto increment value next_auto_inc_val. More...
bool	populate_partition_name_hash (partition_info *part_info)
	Populate partition_name_hash with partition and subpartition names from part_info. More...
const char *	get_partition_name (size_t part_id) const
	Get partition name. More...
Public Member Functions inherited from Handler_share
	Handler_share ()=default
virtual	~Handler_share ()=default

Public Attributes
bool	auto_inc_initialized
	Set if auto increment is used an initialized. More...
mysql_mutex_t *	auto_inc_mutex
	Mutex protecting next_auto_inc_val. More...
ulonglong	next_auto_inc_val
	First non reserved auto increment value. More...
std::unique_ptr< collation_unordered_map< std::string, unique_ptr_my_free< PART_NAME_DEF > > >	partition_name_hash
	Hash of partition names. More...

Private Member Functions
bool	insert_partition_name_in_hash (const char *name, uint part_id, bool is_subpart)
	Insert [sub]partition name into partition_name_hash. More...

Private Attributes
const uchar **	partition_names

Detailed Description

Partition specific Handler_share.

Constructor & Destructor Documentation

Partition_share()

Partition_share::Partition_share

(

)

~Partition_share()

Partition_share::~Partition_share ( )

override

Member Function Documentation

get_partition_name()

const char * Partition_share::get_partition_name

(

size_t

part_id

)

const

Get partition name.

Parameters

part_id

Partition id (for subpartitioned table only subpartition names will be returned.)

Returns

partition name or NULL if error.

init_auto_inc_mutex()

bool Partition_share::init_auto_inc_mutex

(

TABLE_SHARE *

table_share

)

Initializes and sets auto_inc_mutex.

Initialize auto increment mutex in share.

Only needed to be called if the table have an auto increment. Must hold TABLE_SHARE::LOCK_ha_data when calling.

Returns

Operation status.

Return values

true	Failure (out of memory).
false	Success.

insert_partition_name_in_hash()

bool Partition_share::insert_partition_name_in_hash ( const char *  name, uint  part_id, bool  is_subpart  )

private

Insert [sub]partition name into partition_name_hash.

Parameters

name	Partition name.
part_id	Partition id.
is_subpart	True if subpartition else partition.

Returns

Operation status.

Return values

false	Success.
true	Failure.

lock_auto_inc()

void Partition_share::lock_auto_inc ( )

inline

lock mutex protecting auto increment value next_auto_inc_val.

populate_partition_name_hash()

bool Partition_share::populate_partition_name_hash

(

partition_info *

part_info

)

Populate partition_name_hash with partition and subpartition names from part_info.

Populate the partition_name_hash in part_share.

Parameters

part_info

Partition info containing all partitions metadata.

Returns

Operation status.

Return values

false	Success.
true	Failure.

release_auto_inc_if_possible()

void Partition_share::release_auto_inc_if_possible	(	THD *	thd,
		TABLE_SHARE *	table_share,
		const ulonglong	next_insert_id,
		const ulonglong	max_reserved
	)

Release reserved auto increment values not used.

Parameters

thd	Thread.
table_share	Table Share
next_insert_id	Next insert id (first non used auto inc value).
max_reserved	End of reserved auto inc range.

unlock_auto_inc()

void Partition_share::unlock_auto_inc ( )

inline

unlock mutex protecting auto increment value next_auto_inc_val.

Member Data Documentation

auto_inc_initialized

bool Partition_share::auto_inc_initialized

Set if auto increment is used an initialized.

auto_inc_mutex

mysql_mutex_t* Partition_share::auto_inc_mutex

Mutex protecting next_auto_inc_val.

Initialized if table uses auto increment.

next_auto_inc_val

ulonglong Partition_share::next_auto_inc_val

First non reserved auto increment value.

partition_name_hash

std::unique_ptr< collation_unordered_map<std::string, unique_ptr_my_free<PART_NAME_DEF> > > Partition_share::partition_name_hash

Hash of partition names.

Initialized by the first handler instance of a table_share calling populate_partition_name_hash(). After that it is read-only, i.e. no locking required for reading.

partition_names

const uchar** Partition_share::partition_names

private

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

• sql/partitioning/partition_handler.h
• sql/partitioning/partition_handler.cc