fulltext.h File Reference

Some definitions for full-text indices. More...

#include "ft_global.h"
#include "mysql/plugin_ftparser.h"
#include "storage/myisam/myisamdef.h"

Go to the source code of this file.

Macros
#define	HA_FT_WTYPE   HA_KEYTYPE_FLOAT
#define	HA_FT_WLEN   4
#define	FT_SEGS   2
#define	ft_sintXkorr(A)   mi_sint4korr(A)
	Accessor methods for the weight and the number of subkeys in a buffer. More...
#define	ft_intXstore(T, A)   mi_int4store(T, A)
#define	ft_floatXget(M)   mi_float4get(M)

Functions
int	_mi_ft_cmp (MI_INFO *, uint, const uchar *, const uchar *)
int	_mi_ft_add (MI_INFO *, uint, uchar *, const uchar *, my_off_t)
int	_mi_ft_del (MI_INFO *, uint, uchar *, const uchar *, my_off_t)
uint	_mi_ft_convert_to_ft2 (MI_INFO *, uint, uchar *)

Variables
const HA_KEYSEG	ft_keysegs [FT_SEGS]

Detailed Description

Some definitions for full-text indices.

Macro Definition Documentation

ft_floatXget

#define ft_floatXget

(

M

)

mi_float4get(M)

ft_intXstore

#define ft_intXstore	(		T,
			A
	)		mi_int4store(T, A)

FT_SEGS

#define FT_SEGS   2

ft_sintXkorr

#define ft_sintXkorr

(

A

)

mi_sint4korr(A)

Accessor methods for the weight and the number of subkeys in a buffer.

The weight is of float type and subkeys number is of integer type. Both are stored in the same position of the buffer and the stored object is identified by the sign (bit): the weight value is positive whilst the number of subkeys is negative.

In light of C's strict-aliasing rules, which roughly state that an object must not be accessed through incompatible types, these methods are used to avoid any problems arising from the type duality inside the buffer. The values are retrieved using a character type which can access any object.

HA_FT_WLEN

#define HA_FT_WLEN   4

HA_FT_WTYPE

#define HA_FT_WTYPE   HA_KEYTYPE_FLOAT

Function Documentation

_mi_ft_add()

int _mi_ft_add	(	MI_INFO *	info,
		uint	keynr,
		uchar *	keybuf,
		const uchar *	record,
		my_off_t	pos
	)

_mi_ft_cmp()

int _mi_ft_cmp	(	MI_INFO *	info,
		uint	keynr,
		const uchar *	rec1,
		const uchar *	rec2
	)

_mi_ft_convert_to_ft2()

uint _mi_ft_convert_to_ft2	(	MI_INFO *	info,
		uint	keynr,
		uchar *	key
	)

_mi_ft_del()

int _mi_ft_del	(	MI_INFO *	info,
		uint	keynr,
		uchar *	keybuf,
		const uchar *	record,
		my_off_t	pos
	)

Variable Documentation

ft_keysegs

const HA_KEYSEG ft_keysegs[FT_SEGS]

extern