table_def Class Reference

A table definition from the master. More...

#include <rpl_utility.h>

Public Member Functions
	table_def ()=default
	No-op constructor. More...
	table_def (unsigned char *types, ulong size, uchar *field_metadata, int metadata_size, uchar *null_bitmap, uint16 flags, const std::vector< unsigned int > &vector_dimensionality)
	Constructor. More...
	~table_def ()
ulong	size () const
	Return the number of fields there is type data for. More...
ulong	filtered_size (bool replica_has_gipk) const
	Return the number of fields there is type data for minus the GIPK field if this field does not exist in the replica. More...
enum_field_types	binlog_type (ulong index) const
int	json_column_count () const
	Return the number of JSON columns in this table. More...
enum_field_types	type (ulong index) const
uint	field_metadata (uint index) const
bool	is_array (uint index) const
	Returns whether or not the field at index is a typed array. More...
bool	maybe_null (uint index) const
uint32	calc_field_size (uint col, const uchar *master_data) const
std::vector< unsignedint >::const_iterator	get_vector_dimensionality_begin () const
std::vector< unsignedint >::const_iterator	get_vector_dimensionality_end () const
bool	compatible_with (THD *thd, Relay_log_info *rli, TABLE *table, TABLE **conv_table_var)
	Decide if the table definition is compatible with a table. More...
TABLE *	create_conversion_table (THD *thd, Relay_log_info *rli, TABLE *target_table, bool replica_has_gipk) const
	Create a virtual in-memory temporary table structure. More...
bool	compute_source_table_gipk_info (THD &thd, TABLE *table)
	Evaluates if the source table might contain a GIPK. More...
bool	is_gipk_present_on_source_table () const
	Checks if the table contains a GIPK. More...

Static Public Member Functions
static uint	vector_column_count (const unsigned char *types, ulong size)
	Return the number of VECTOR columns. More...

Private Attributes
ulong	m_size
unsigned char *	m_type
uint	m_field_metadata_size
uint *	m_field_metadata
uchar *	m_null_bits
uint16	m_flags
uchar *	m_memory
int	m_json_column_count
bool *	m_is_array
bool	m_is_gipk_set
bool	m_is_gipk_on_table
std::vector< unsigned int >	m_vector_dimensionality

Detailed Description

A table definition from the master.

The responsibilities of this class is:

• Extract and decode table definition data from the table map event
• Check if table definition in table map is compatible with table definition on slave
• expose the type information so that it can be used when encoding or decoding row event data.

Constructor & Destructor Documentation

table_def() [1/2]

table_def::table_def ( )

default

No-op constructor.

Instances of RPL_Table_ref are created by first allocating memory, then placement-new-ing an RPL_Table_ref object containing an uninitialized table_def object which is only conditionally initialized. See Table_map_log_event::do_apply_event().

table_def() [2/2]

table_def::table_def	(	unsigned char *	types,
		ulong	size,
		uchar *	field_metadata,
		int	metadata_size,
		uchar *	null_bitmap,
		uint16	flags,
		const std::vector< unsigned int > &	vector_dimensionality
	)

Constructor.

Parameters

types	Array of types, each stored as a byte
size	Number of elements in array 'types'
field_metadata	Array of extra information about fields
metadata_size	Size of the field_metadata array
null_bitmap	The bitmap of fields that can be null
flags	Table flags
vector_dimensionality	Vector dimensionality array

~table_def()

table_def::~table_def

(

)

Member Function Documentation

binlog_type()

enum_field_types table_def::binlog_type ( ulong  index ) const

inline

calc_field_size()

uint32 table_def::calc_field_size	(	uint	col,
		const uchar *	master_data
	)		const

compatible_with()

bool table_def::compatible_with	(	THD *	thd,
		Relay_log_info *	rli,
		TABLE *	table,
		TABLE **	conv_table_var
	)

Decide if the table definition is compatible with a table.

Is the definition compatible with a table when it does not belong to the data dictionary?

Compare the definition with a table to see if it is compatible with it.

A table definition is compatible with a table if:

• The columns types of the table definition is a (not necessarily proper) prefix of the column type of the table.
• The other way around.
• Each column on the master that also exists on the slave can be converted according to the current settings of REPLICA_TYPE_CONVERSIONS.

Parameters

	thd	Current thread
	rli	Pointer to relay log info
	table	Pointer to table to compare with.
[out]	conv_table_var	Pointer to temporary table for holding conversion table.

Return values

1	if the table definition is not compatible with table
0	if the table definition is compatible with table

This function first finds out whether the table belongs to the data dictionary. When not, it will compare the master table with an existing table on the slave and see if they are compatible with respect to the current settings of REPLICA_TYPE_CONVERSIONS.

If the tables are compatible and conversions are required, tmp_table_var will be set to a virtual temporary table with field pointers for the fields that require conversions. This allow simple checking of whether a conversion are to be applied or not.

If tables are compatible, but no conversions are necessary, tmp_table_var will be set to NULL.

Parameters

[in]	rli	Relay log info, for error reporting.
[in]	table	Table to compare with
[out]	conv_table_var	Virtual temporary table for performing conversions, if necessary.

Return values

true	Master table is compatible with slave table.
false	When the table belongs to the data dictionary or master table is not compatible with slave table.

compute_source_table_gipk_info()

bool table_def::compute_source_table_gipk_info	(	THD &	thd,
		TABLE *	table
	)

Evaluates if the source table might contain a GIPK.

Note

for servers of older versions that do not fully support GIPK, this sets the info that is a guess based on available information replication has.

In the case when the replica has a GIPK, the source is from an old version that does not indicate if it has a GIPK or not, and the source either has extra columns, or the replica has two more more extra columns true is returned. This function does not report an error.

Parameters

thd	The thread object associated to the application
table	The table in the replica.

Returns

true if this table definition is found to be incompatible with the table, false otherwise.

create_conversion_table()

TABLE * table_def::create_conversion_table	(	THD *	thd,
		Relay_log_info *	rli,
		TABLE *	target_table,
		bool	replica_has_gipk
	)		const

Create a virtual in-memory temporary table structure.

Create a conversion table.

The table structure has records and field array so that a row can be unpacked into the record for further processing.

In the virtual table, each field that requires conversion will have a non-NULL value, while fields that do not require conversion will have a NULL value.

Some information that is missing in the events, such as the character set for string types, are taken from the table that the field is going to be pushed into, so the target table that the data eventually need to be pushed into need to be supplied.

Parameters

thd	Thread to allocate memory from.
rli	Relay log info structure, for error reporting.
target_table	Target table for fields.
replica_has_gipk	Does the replica table contain a GIPK

Returns

A pointer to a temporary table with memory allocated in the thread's memroot, NULL if the table could not be created

If the function is unable to create the conversion table, an error will be printed and NULL will be returned.

Returns

Pointer to conversion table, or NULL if unable to create conversion table.

field_metadata()

uint table_def::field_metadata ( uint  index ) const

inline

filtered_size()

ulong table_def::filtered_size ( bool  replica_has_gipk ) const

inline

Return the number of fields there is type data for minus the GIPK field if this field does not exist in the replica.

Returns

The number of fields there is a type minus the GIPK

get_vector_dimensionality_begin()

std::vector< unsignedint >::const_iterator table_def::get_vector_dimensionality_begin ( ) const

inline

get_vector_dimensionality_end()

std::vector< unsignedint >::const_iterator table_def::get_vector_dimensionality_end ( ) const

inline

is_array()

bool table_def::is_array ( uint  index ) const

inline

Returns whether or not the field at index is a typed array.

is_gipk_present_on_source_table()

bool table_def::is_gipk_present_on_source_table

(

)

const

Checks if the table contains a GIPK.

Note

for servers of older versions that do not fully support GIPK, this method returns a guess based on available information replication has.

Returns

true if we believe the table to contain a GIPK, false otherwise

json_column_count()

int table_def::json_column_count ( ) const

inline

Return the number of JSON columns in this table.

maybe_null()

bool table_def::maybe_null ( uint  index ) const

inline

size()

ulong table_def::size ( ) const

inline

Return the number of fields there is type data for.

Returns

The number of fields that there is type data for.

type()

enum_field_types table_def::type ( ulong  index ) const

inline

vector_column_count()

static uint table_def::vector_column_count ( const unsigned char *  types, ulong  size  )

inlinestatic

Return the number of VECTOR columns.

Member Data Documentation

m_field_metadata

uint* table_def::m_field_metadata

private

m_field_metadata_size

uint table_def::m_field_metadata_size

private

m_flags

uint16 table_def::m_flags

private

m_is_array

bool* table_def::m_is_array

private

m_is_gipk_on_table

bool table_def::m_is_gipk_on_table

private

m_is_gipk_set

bool table_def::m_is_gipk_set

private

m_json_column_count

int table_def::m_json_column_count

mutableprivate

m_memory

uchar* table_def::m_memory

private

m_null_bits

uchar* table_def::m_null_bits

private

m_size

ulong table_def::m_size

private

m_type

unsigned char* table_def::m_type

private

m_vector_dimensionality

std::vector<unsigned int> table_def::m_vector_dimensionality

private

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

• sql/rpl_utility.h
• sql/rpl_utility.cc