#include <key.h>

Public Member Functions
void	init_from_field (Field *fld)
	Initialize KEY_PART_INFO from the given field. More...

void	init_flags ()
	Fill data from given field. More...

Public Attributes
Field *	field {nullptr}

uint	offset {0}

uint	null_offset {0}

uint16	length {0}

uint16	store_length {0}

uint16	fieldnr {0}

uint16	key_part_flag {0}

uint8	type {0}

uint8	null_bit {0}

bool	bin_cmp {false}
	True - if key part allows trivial binary comparison, False - if charset collation function needs to be involved. More...

Member Function Documentation

◆ init_flags()

void KEY_PART_INFO::init_flags ( )

Fill data from given field.

Initialize key_part_flag from source field.

◆ init_from_field()

void KEY_PART_INFO::init_from_field ( Field * fld )

Initialize KEY_PART_INFO from the given field.

Parameters

fld	The field to initialize keypart from

Member Data Documentation

◆ bin_cmp

bool KEY_PART_INFO::bin_cmp {false}

True - if key part allows trivial binary comparison, False - if charset collation function needs to be involved.

Note: Not set for KEY_PART_INFO which are used for creating tables, only set when table is opened or for internal temporary tables.

This value is set a bit too optimistically and disregards the way in which value is stored in record (e.g. it is true for BLOB types). So in practice key_cmp_if_same() also has to check key_part_flag for presence of HA_BLOB_PART, HA_VAR_LENGTH_PART and HA_BIT_PART flags.

◆ field

Field* KEY_PART_INFO::field {nullptr}

◆ fieldnr

uint16 KEY_PART_INFO::fieldnr {0}

◆ key_part_flag

uint16 KEY_PART_INFO::key_part_flag {0}

◆ length

uint16 KEY_PART_INFO::length {0}

◆ null_bit

uint8 KEY_PART_INFO::null_bit {0}

◆ null_offset

uint KEY_PART_INFO::null_offset {0}

◆ offset

uint KEY_PART_INFO::offset {0}

◆ store_length

uint16 KEY_PART_INFO::store_length {0}

◆ type

uint8 KEY_PART_INFO::type {0}

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

sql/key.h
sql/table.cc

Public Member Functions

Public Attributes