MySQL 8.0.30
Source Code Documentation
fulltext.h
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1/* Copyright (c) 2000, 2022, Oracle and/or its affiliates.
2
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15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License, version 2.0, for more details.
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21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
22
23/* Written by Sergei A. Golubchik, who has a shared copyright to this code */
24
25/**
26 @file storage/myisam/fulltext.h
27 Some definitions for full-text indices
28*/
29
30#include "ft_global.h"
33
34#define HA_FT_WTYPE HA_KEYTYPE_FLOAT
35#define HA_FT_WLEN 4
36#define FT_SEGS 2
37
38/**
39 Accessor methods for the weight and the number of subkeys in a buffer.
40
41 The weight is of float type and subkeys number is of integer type. Both
42 are stored in the same position of the buffer and the stored object is
43 identified by the sign (bit): the weight value is positive whilst the
44 number of subkeys is negative.
45
46 In light of C's strict-aliasing rules, which roughly state that an object
47 must not be accessed through incompatible types, these methods are used to
48 avoid any problems arising from the type duality inside the buffer. The
49 values are retrieved using a character type which can access any object.
50*/
51#define ft_sintXkorr(A) mi_sint4korr(A)
52#define ft_intXstore(T, A) mi_int4store(T, A)
53#define ft_floatXget(M) mi_float4get(M)
54
55extern const HA_KEYSEG ft_keysegs[FT_SEGS];
56
57int _mi_ft_cmp(MI_INFO *, uint, const uchar *, const uchar *);
58int _mi_ft_add(MI_INFO *, uint, uchar *, const uchar *, my_off_t);
59int _mi_ft_del(MI_INFO *, uint, uchar *, const uchar *, my_off_t);
60
Some definitions for full-text indices.
const HA_KEYSEG ft_keysegs[FT_SEGS]
Definition: ft_static.cc:36
int _mi_ft_add(MI_INFO *, uint, uchar *, const uchar *, my_off_t)
Definition: ft_update.cc:232
uint _mi_ft_convert_to_ft2(MI_INFO *, uint, uchar *)
Definition: ft_update.cc:283
int _mi_ft_del(MI_INFO *, uint, uchar *, const uchar *, my_off_t)
Definition: ft_update.cc:249
int _mi_ft_cmp(MI_INFO *, uint, const uchar *, const uchar *)
Definition: ft_update.cc:165
#define FT_SEGS
Definition: fulltext.h:36
ulonglong my_off_t
Definition: my_inttypes.h:71
unsigned char uchar
Definition: my_inttypes.h:51
Definition: my_compare.h:59
Definition: myisamdef.h:251
unsigned int uint
Definition: uca-dump.cc:29