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This commit is contained in:
serg@serg.mysql.com
2002-04-18 14:12:29 +00:00
parent 08384a3abd
commit 3cc69d5a64
5 changed files with 77 additions and 27 deletions
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65
myisam/ft_boolean_search.c
View File

@ -59,6 +59,7 @@ static double *nwghts=_nwghts+5; /* nwghts[i] = -0.5*1.5**i */
typedef struct st_ftb_expr FTB_EXPR;
struct st_ftb_expr {
FTB_EXPR *up;
byte *quot, *qend;
float weight;
uint flags;
my_off_t docid[2]; /* for index search and for scan */
@ -126,6 +127,7 @@ void _ftb_parse_query(FTB *ftb, byte **start, byte *end,
return;
param.prev=' ';
param.quot=up->quot;
while ((res=ft_get_word(start,end,&w,&param)))
{
int r=param.plusminus;
@ -149,7 +151,7 @@ void _ftb_parse_query(FTB *ftb, byte **start, byte *end,
ftbw->word[0]=w.len;
if (param.yesno > 0) up->ythresh++;
queue_insert(& ftb->queue, (byte *)ftbw);
ftb->with_scan|=param.trunc;
ftb->with_scan|=(param.trunc & FTB_FLAG_TRUNC);
break;
case 2: /* left bracket */
ftbe=(FTB_EXPR *)alloc_root(&ftb->mem_root, sizeof(FTB_EXPR));
@ -160,10 +162,12 @@ void _ftb_parse_query(FTB *ftb, byte **start, byte *end,
ftbe->up=up;
ftbe->ythresh=ftbe->yweaks=0;
ftbe->docid[0]=ftbe->docid[1]=HA_POS_ERROR;
if ((ftbe->quot=param.quot)) ftb->with_scan|=2;
if (param.yesno > 0) up->ythresh++;
_ftb_parse_query(ftb, start, end, ftbe, depth+1);
break;
case 3: /* right bracket */
if (up->quot) up->qend=param.quot;
return;
}
}
@ -260,7 +264,7 @@ FT_INFO * ft_init_boolean_search(MI_INFO *info, uint keynr, byte *query,
ftbe->weight=1;
ftbe->flags=FTB_FLAG_YES;
ftbe->nos=1;
ftbe->up=0;
ftbe->quot=ftbe->up=0;
ftbe->ythresh=ftbe->yweaks=0;
ftbe->docid[0]=ftbe->docid[1]=HA_POS_ERROR;
ftb->root=ftbe;
@ -270,16 +274,39 @@ FT_INFO * ft_init_boolean_search(MI_INFO *info, uint keynr, byte *query,
memcpy(ftb->list, ftb->queue.root+1, sizeof(FTB_WORD *)*ftb->queue.elements);
qsort2(ftb->list, ftb->queue.elements, sizeof(FTB_WORD *),
(qsort2_cmp)FTB_WORD_cmp_list, ftb->charset);
if (ftb->queue.elements<2) ftb->with_scan=0;
if (ftb->queue.elements<2) ftb->with_scan &= ~FTB_FLAG_TRUNC;
ftb->state=READY;
return ftb;
}
void _ftb_climb_the_tree(FTB_WORD *ftbw, uint mode)
/* returns 1 if str0 contain str1 */
int _ftb_strstr(const byte *s0, const byte *e0,
const byte *s1, const byte *e1,
CHARSET_INFO *cs)
{
const byte *p;
while (s0 < e0)
{
while (s0 < e0 && cs->to_upper[*s0++] != cs->to_upper[*s1])
/* no-op */;
if (s0 >= e0)
return 0;
p=s1+1;
while (s0 < e0 && p < e1 && cs->to_upper[*s0++] == cs->to_upper[*p++])
/* no-op */;
if (p >= e1)
return 1;
}
return 0;
}
void _ftb_climb_the_tree(FTB *ftb, FTB_WORD *ftbw, FT_SEG_ITERATOR *ftsi_orig)
{
FT_SEG_ITERATOR ftsi;
FTB_EXPR *ftbe;
float weight=ftbw->weight;
int yn=ftbw->flags, ythresh;
int yn=ftbw->flags, ythresh, mode=(ftsi_orig != 0);
my_off_t curdoc=ftbw->docid[mode];
for (ftbe=ftbw->up; ftbe; ftbe=ftbe->up)
@ -300,6 +327,20 @@ void _ftb_climb_the_tree(FTB_WORD *ftbw, uint mode)
{
yn=ftbe->flags;
weight=ftbe->cur_weight*ftbe->weight;
if (mode && ftbe->quot)
{
int not_found=1;
memcpy(&ftsi, ftsi_orig, sizeof(ftsi));
while (_mi_ft_segiterator(&ftsi) && not_found)
{
if (!ftsi.pos)
continue;
not_found = ! _ftb_strstr(ftsi.pos, ftsi.pos+ftsi.len,
ftbe->quot, ftbe->qend, ftb->charset);
}
if (not_found) break;
} /* ftbe->quot */
}
else
break;
@ -356,7 +397,7 @@ int ft_boolean_read_next(FT_INFO *ftb, char *record)
{
while (curdoc==(ftbw=(FTB_WORD *)queue_top(& ftb->queue))->docid[0])
{
_ftb_climb_the_tree(ftbw,0);
_ftb_climb_the_tree(ftb, ftbw, 0);
/* update queue */
r=_mi_search(info, keyinfo, (uchar*) ftbw->word, USE_WHOLE_KEY,
@ -414,7 +455,7 @@ float ft_boolean_find_relevance(FT_INFO *ftb, byte *record, uint length)
FT_WORD word;
FTB_WORD *ftbw;
FTB_EXPR *ftbe;
FT_SEG_ITERATOR ftsi;
FT_SEG_ITERATOR ftsi, ftsi2;
const byte *end;
my_off_t docid=ftb->info->lastpos;
@ -423,17 +464,11 @@ float ft_boolean_find_relevance(FT_INFO *ftb, byte *record, uint length)
if (!ftb->queue.elements)
return 0;
#if NOT_USED
if (ftb->state == READY || ftb->state == INDEX_DONE)
ftb->state=SCAN;
else if (ftb->state != SCAN)
return -3.0;
#endif
if (ftb->keynr==NO_SUCH_KEY)
_mi_ft_segiterator_dummy_init(record, length, &ftsi);
else
_mi_ft_segiterator_init(ftb->info, ftb->keynr, record, &ftsi);
memcpy(&ftsi2, &ftsi, sizeof(ftsi));
while (_mi_ft_segiterator(&ftsi))
{
@ -464,7 +499,7 @@ float ft_boolean_find_relevance(FT_INFO *ftb, byte *record, uint length)
if (ftbw->docid[1] == docid)
continue;
ftbw->docid[1]=docid;
_ftb_climb_the_tree(ftbw,1);
_ftb_climb_the_tree(ftb, ftbw, &ftsi2);
}
}
}

14
myisam/ft_parser.c
View File

@ -133,13 +133,20 @@ byte ft_get_word(byte **start, byte *end, FT_WORD *word, FTB_PARAM *param)
for (;doc<end;doc++)
{
if (true_word_char(*doc)) break;
if (*doc == FTB_LBR || *doc == FTB_RBR)
if (*doc == FTB_RQUOT && param->quot) {
param->quot=doc-1;
*start=doc+1;
return 3; /* FTB_RBR */
}
if ((*doc == FTB_LBR || *doc == FTB_RBR || *doc == FTB_LQUOT)
&& !param->quot)
{
/* param->prev=' '; */
*start=doc+1;
if (*doc == FTB_LQUOT) param->quot=*start;
return (*doc == FTB_RBR)+2;
}
if (param->prev == ' ')
if (param->prev == ' ' && !param->quot)
{
if (*doc == FTB_YES ) { param->yesno=+1; continue; } else
if (*doc == FTB_EGAL) { param->yesno= 0; continue; } else
@ -149,7 +156,8 @@ byte ft_get_word(byte **start, byte *end, FT_WORD *word, FTB_PARAM *param)
if (*doc == FTB_NEG ) { param->pmsign=!param->pmsign; continue; }
}
param->prev=*doc;
param->yesno=param->plusminus=param->pmsign=0;
param->yesno=(param->quot != 0);
param->plusminus=param->pmsign=0;
}
mwc=0;

5
myisam/ftdefs.h
View File

@ -95,6 +95,8 @@ extern ulong collstat;
#define FTB_RBR (ft_boolean_syntax[6])
#define FTB_NEG (ft_boolean_syntax[7])
#define FTB_TRUNC (ft_boolean_syntax[8])
#define FTB_LQUOT (ft_boolean_syntax[10])
#define FTB_RQUOT (ft_boolean_syntax[11])
typedef struct st_ft_word {
byte * pos;
@ -111,6 +113,7 @@ typedef struct st_ftb_param {
int plusminus;
bool pmsign;
bool trunc;
byte *quot;
} FTB_PARAM;
int is_stopword(char *word, uint len);
@ -132,7 +135,7 @@ uint _mi_ft_segiterator(FT_SEG_ITERATOR *);
void ft_parse_init(TREE *, CHARSET_INFO *);
int ft_parse(TREE *, byte *, int);
FT_WORD * ft_linearize(/*MI_INFO *, uint, byte *, */TREE *);
FT_WORD * ft_linearize(TREE *);
FT_WORD * _mi_ft_parserecord(MI_INFO *, uint, byte *, const byte *);
uint _mi_ft_parse(TREE *parsed, MI_INFO *info, uint keynr, const byte *record);

3
mysql-test/r/fulltext.result
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@ -67,6 +67,9 @@ Full-text indexes are called collections 1
Only MyISAM tables support collections 2
Function MATCH ... AGAINST() is used to do a search 0
Full-text search in MySQL implements vector space model 0
select * from t1 where MATCH a,b AGAINST ('"Now sUPPort"' IN BOOLEAN MODE);
a b
MySQL has now support for full-text search
select * from t1 where MATCH a AGAINST ("search" IN BOOLEAN MODE);
a b
Full-text search in MySQL implements vector space model

3
mysql-test/t/fulltext.test
View File

@ -20,7 +20,6 @@ select * from t1 where MATCH(a,b) AGAINST ("indexes collections");
# UNION of fulltext's
select * from t1 where MATCH(a,b) AGAINST ("collections") UNION ALL select * from t1 where MATCH(a,b) AGAINST ("indexes");
# boolean search
select * from t1 where MATCH(a,b) AGAINST("support -collections" IN BOOLEAN MODE);
@ -34,6 +33,8 @@ select * from t1 where MATCH(a,b) AGAINST("+search -(support vector)" IN BOOLEAN
select *, MATCH(a,b) AGAINST("support collections" IN BOOLEAN MODE) as x from t1;
select *, MATCH(a,b) AGAINST("collections support" IN BOOLEAN MODE) as x from t1;
select * from t1 where MATCH a,b AGAINST ('"Now sUPPort"' IN BOOLEAN MODE);
# boolean w/o index:
select * from t1 where MATCH a AGAINST ("search" IN BOOLEAN MODE);