summaryrefslogtreecommitdiff
path: root/storage/myisam/ft_update.c
blob: e3e4c62158f6d946547d399b85fcd336d8c300c7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
/* Copyright (C) 2000-2004, 2006 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

/* Written by Sergei A. Golubchik, who has a shared copyright to this code */

/* functions to work with full-text indices */

#include "ftdefs.h"
#include <math.h>

void _mi_ft_segiterator_init(MI_INFO *info, uint keynr, const uchar *record,
			     FT_SEG_ITERATOR *ftsi)
{
  DBUG_ENTER("_mi_ft_segiterator_init");

  ftsi->num=info->s->keyinfo[keynr].keysegs;
  ftsi->seg=info->s->keyinfo[keynr].seg;
  ftsi->rec=record;
  DBUG_VOID_RETURN;
}

void _mi_ft_segiterator_dummy_init(const uchar *record, uint len,
				   FT_SEG_ITERATOR *ftsi)
{
  DBUG_ENTER("_mi_ft_segiterator_dummy_init");

  ftsi->num=1;
  ftsi->seg=0;
  ftsi->pos=record;
  ftsi->len=len;
  DBUG_VOID_RETURN;
}

/*
  This function breaks convention "return 0 in success"
  but it's easier to use like this

     while(_mi_ft_segiterator())

  so "1" means "OK", "0" means "EOF"
*/

uint _mi_ft_segiterator(register FT_SEG_ITERATOR *ftsi)
{
  DBUG_ENTER("_mi_ft_segiterator");

  if (!ftsi->num)
    DBUG_RETURN(0);

  ftsi->num--;
  if (!ftsi->seg)
    DBUG_RETURN(1);

  ftsi->seg--;

  if (ftsi->seg->null_bit &&
      (ftsi->rec[ftsi->seg->null_pos] & ftsi->seg->null_bit))
  {
    ftsi->pos=0;
    DBUG_RETURN(1);
  }
  ftsi->pos= ftsi->rec+ftsi->seg->start;
  if (ftsi->seg->flag & HA_VAR_LENGTH_PART)
  {
    uint pack_length= (ftsi->seg->bit_start);
    ftsi->len= (pack_length == 1 ? (uint) *(uchar*) ftsi->pos :
                uint2korr(ftsi->pos));
    ftsi->pos+= pack_length;			 /* Skip VARCHAR length */
    DBUG_RETURN(1);
  }
  if (ftsi->seg->flag & HA_BLOB_PART)
  {
    ftsi->len=_mi_calc_blob_length(ftsi->seg->bit_start,ftsi->pos);
    memcpy_fixed((char*) &ftsi->pos, ftsi->pos+ftsi->seg->bit_start,
		 sizeof(char*));
    DBUG_RETURN(1);
  }
  ftsi->len=ftsi->seg->length;
  DBUG_RETURN(1);
}


/* parses a document i.e. calls ft_parse for every keyseg */

uint _mi_ft_parse(TREE *parsed, MI_INFO *info, uint keynr, const uchar *record,
                  MYSQL_FTPARSER_PARAM *param, MEM_ROOT *mem_root)
{
  FT_SEG_ITERATOR ftsi;
  struct st_mysql_ftparser *parser;
  DBUG_ENTER("_mi_ft_parse");

  _mi_ft_segiterator_init(info, keynr, record, &ftsi);

  ft_parse_init(parsed, info->s->keyinfo[keynr].seg->charset);
  parser= info->s->keyinfo[keynr].parser;
  while (_mi_ft_segiterator(&ftsi))
  {
    if (ftsi.pos)
      if (ft_parse(parsed, (uchar *)ftsi.pos, ftsi.len, parser, param, mem_root))
        DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}

FT_WORD *_mi_ft_parserecord(MI_INFO *info, uint keynr, const uchar *record,
                             MEM_ROOT *mem_root)
{
  TREE ptree;
  MYSQL_FTPARSER_PARAM *param;
  DBUG_ENTER("_mi_ft_parserecord");
  if (! (param= ftparser_call_initializer(info, keynr, 0)))
    DBUG_RETURN(NULL);
  bzero((char*) &ptree, sizeof(ptree));
  param->flags= 0;
  if (_mi_ft_parse(&ptree, info, keynr, record, param, mem_root))
    DBUG_RETURN(NULL);

  DBUG_RETURN(ft_linearize(&ptree, mem_root));
}

static int _mi_ft_store(MI_INFO *info, uint keynr, uchar *keybuf,
			FT_WORD *wlist, my_off_t filepos)
{
  uint key_length;
  DBUG_ENTER("_mi_ft_store");

  for (; wlist->pos; wlist++)
  {
    key_length=_ft_make_key(info,keynr,keybuf,wlist,filepos);
    if (_mi_ck_write(info,keynr,(uchar*) keybuf,key_length))
      DBUG_RETURN(1);
   }
   DBUG_RETURN(0);
}

static int _mi_ft_erase(MI_INFO *info, uint keynr, uchar *keybuf,
			FT_WORD *wlist, my_off_t filepos)
{
  uint key_length, err=0;
  DBUG_ENTER("_mi_ft_erase");

  for (; wlist->pos; wlist++)
  {
    key_length=_ft_make_key(info,keynr,keybuf,wlist,filepos);
    if (_mi_ck_delete(info,keynr,(uchar*) keybuf,key_length))
      err=1;
   }
   DBUG_RETURN(err);
}

/*
  Compares an appropriate parts of two WORD_KEY keys directly out of records
  returns 1 if they are different
*/

#define THOSE_TWO_DAMN_KEYS_ARE_REALLY_DIFFERENT 1
#define GEE_THEY_ARE_ABSOLUTELY_IDENTICAL	 0

int _mi_ft_cmp(MI_INFO *info, uint keynr, const uchar *rec1, const uchar *rec2)
{
  FT_SEG_ITERATOR ftsi1, ftsi2;
  CHARSET_INFO *cs=info->s->keyinfo[keynr].seg->charset;
  DBUG_ENTER("_mi_ft_cmp");
  _mi_ft_segiterator_init(info, keynr, rec1, &ftsi1);
  _mi_ft_segiterator_init(info, keynr, rec2, &ftsi2);

  while (_mi_ft_segiterator(&ftsi1) && _mi_ft_segiterator(&ftsi2))
  {
    if ((ftsi1.pos != ftsi2.pos) &&
        (!ftsi1.pos || !ftsi2.pos ||
         mi_compare_text(cs, (uchar*) ftsi1.pos,ftsi1.len,
                         (uchar*) ftsi2.pos,ftsi2.len,0,0)))
      DBUG_RETURN(THOSE_TWO_DAMN_KEYS_ARE_REALLY_DIFFERENT);
  }
  DBUG_RETURN(GEE_THEY_ARE_ABSOLUTELY_IDENTICAL);
}


/* update a document entry */

int _mi_ft_update(MI_INFO *info, uint keynr, uchar *keybuf,
                  const uchar *oldrec, const uchar *newrec, my_off_t pos)
{
  int error= -1;
  FT_WORD *oldlist,*newlist, *old_word, *new_word;
  CHARSET_INFO *cs=info->s->keyinfo[keynr].seg->charset;
  uint key_length;
  int cmp, cmp2;
  DBUG_ENTER("_mi_ft_update");

  if (!(old_word=oldlist=_mi_ft_parserecord(info, keynr, oldrec,
                                            &info->ft_memroot)) ||
      !(new_word=newlist=_mi_ft_parserecord(info, keynr, newrec,
                                            &info->ft_memroot)))
    goto err;

  error=0;
  while(old_word->pos && new_word->pos)
  {
    cmp= mi_compare_text(cs, (uchar*) old_word->pos,old_word->len,
                             (uchar*) new_word->pos,new_word->len,0,0);
    cmp2= cmp ? 0 : (fabs(old_word->weight - new_word->weight) > 1.e-5);

    if (cmp < 0 || cmp2)
    {
      key_length=_ft_make_key(info,keynr,keybuf,old_word,pos);
      if ((error=_mi_ck_delete(info,keynr,(uchar*) keybuf,key_length)))
        goto err;
    }
    if (cmp > 0 || cmp2)
    {
      key_length=_ft_make_key(info,keynr,keybuf,new_word,pos);
      if ((error=_mi_ck_write(info,keynr,(uchar*) keybuf,key_length)))
        goto err;
    }
    if (cmp<=0) old_word++;
    if (cmp>=0) new_word++;
 }
 if (old_word->pos)
   error=_mi_ft_erase(info,keynr,keybuf,old_word,pos);
 else if (new_word->pos)
   error=_mi_ft_store(info,keynr,keybuf,new_word,pos);

err:
  free_root(&info->ft_memroot, MYF(MY_MARK_BLOCKS_FREE));
  DBUG_RETURN(error);
}


/* adds a document to the collection */

int _mi_ft_add(MI_INFO *info, uint keynr, uchar *keybuf, const uchar *record,
	       my_off_t pos)
{
  int error= -1;
  FT_WORD *wlist;
  DBUG_ENTER("_mi_ft_add");
  DBUG_PRINT("enter",("keynr: %d",keynr));

  if ((wlist=_mi_ft_parserecord(info, keynr, record, &info->ft_memroot)))
    error=_mi_ft_store(info,keynr,keybuf,wlist,pos);

  free_root(&info->ft_memroot, MYF(MY_MARK_BLOCKS_FREE));
  DBUG_PRINT("exit",("Return: %d",error));
  DBUG_RETURN(error);
}


/* removes a document from the collection */

int _mi_ft_del(MI_INFO *info, uint keynr, uchar *keybuf, const uchar *record,
	       my_off_t pos)
{
  int error= -1;
  FT_WORD *wlist;
  DBUG_ENTER("_mi_ft_del");
  DBUG_PRINT("enter",("keynr: %d",keynr));

  if ((wlist=_mi_ft_parserecord(info, keynr, record, &info->ft_memroot)))
    error=_mi_ft_erase(info,keynr,keybuf,wlist,pos);

  free_root(&info->ft_memroot, MYF(MY_MARK_BLOCKS_FREE));
  DBUG_PRINT("exit",("Return: %d",error));
  DBUG_RETURN(error);
}

uint _ft_make_key(MI_INFO *info, uint keynr, uchar *keybuf, FT_WORD *wptr,
		  my_off_t filepos)
{
  uchar buf[HA_FT_MAXBYTELEN+16];
  DBUG_ENTER("_ft_make_key");

#if HA_FT_WTYPE == HA_KEYTYPE_FLOAT
  {
    float weight=(float) ((filepos==HA_OFFSET_ERROR) ? 0 : wptr->weight);
    mi_float4store(buf,weight);
  }
#else
#error
#endif

  int2store(buf+HA_FT_WLEN,wptr->len);
  memcpy(buf+HA_FT_WLEN+2,wptr->pos,wptr->len);
  DBUG_RETURN(_mi_make_key(info,keynr,(uchar*) keybuf,buf,filepos));
}


/*
  convert key value to ft2
*/

uint _mi_ft_convert_to_ft2(MI_INFO *info, uint keynr, uchar *key)
{
  my_off_t root;
  DYNAMIC_ARRAY *da=info->ft1_to_ft2;
  MI_KEYDEF *keyinfo=&info->s->ft2_keyinfo;
  uchar *key_ptr= (uchar*) dynamic_array_ptr(da, 0), *end;
  uint length, key_length;
  DBUG_ENTER("_mi_ft_convert_to_ft2");

  /* we'll generate one pageful at once, and insert the rest one-by-one */
  /* calculating the length of this page ...*/
  length=(keyinfo->block_length-2) / keyinfo->keylength;
  set_if_smaller(length, da->elements);
  length=length * keyinfo->keylength;

  get_key_full_length_rdonly(key_length, key);
  while (_mi_ck_delete(info, keynr, key, key_length) == 0)
  {
    /*
      nothing to do here.
      _mi_ck_delete() will populate info->ft1_to_ft2 with deleted keys
     */
  }

  /* creating pageful of keys */
  mi_putint(info->buff,length+2,0);
  memcpy(info->buff+2, key_ptr, length);
  info->buff_used=info->page_changed=1;           /* info->buff is used */
  if ((root= _mi_new(info,keyinfo,DFLT_INIT_HITS)) == HA_OFFSET_ERROR ||
      _mi_write_keypage(info,keyinfo,root,DFLT_INIT_HITS,info->buff))
    DBUG_RETURN(-1);

  /* inserting the rest of key values */
  end= (uchar*) dynamic_array_ptr(da, da->elements);
  for (key_ptr+=length; key_ptr < end; key_ptr+=keyinfo->keylength)
    if(_mi_ck_real_write_btree(info, keyinfo, key_ptr, 0, &root, SEARCH_SAME))
      DBUG_RETURN(-1);

  /* now, writing the word key entry */
  ft_intXstore(key+key_length, - (int) da->elements);
  _mi_dpointer(info, key+key_length+HA_FT_WLEN, root);

  DBUG_RETURN(_mi_ck_real_write_btree(info,
                                     info->s->keyinfo+keynr,
                                     key, 0,
                                     &info->s->state.key_root[keynr],
                                     SEARCH_SAME));
}