fulltext.h

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/* Copyright (c) 2000, 2022, Oracle and/or its affiliates.
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   as designated in a particular file or component or in included license
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
   You should have received a copy of the GNU General Public License
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/* Written by Sergei A. Golubchik, who has a shared copyright to this code */
 
/**
  @file storage/myisam/fulltext.h
  Some definitions for full-text indices
*/
 
#include "ft_global.h"
#include "mysql/plugin_ftparser.h"
#include "storage/myisam/myisamdef.h"
 
#define HA_FT_WTYPE HA_KEYTYPE_FLOAT
#define HA_FT_WLEN 4
#define FT_SEGS 2
 
/**
  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.
*/
#define ft_sintXkorr(A) mi_sint4korr(A)
#define ft_intXstore(T, A) mi_int4store(T, A)
#define ft_floatXget(M) mi_float4get(M)
 
extern const HA_KEYSEG ft_keysegs[FT_SEGS];
 
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 *);