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postgresql/contrib/pg_trgm/trgm.h

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Add $PostgreSQL$ markers to a lot of files that were missing them. This particular batch was just for *.c and *.h file. The changes were made with the following 2 commands: find . \( \( -name 'libstemmer' -o -name 'expected' -o -name 'ppport.h' \) -prune \) -o \( -name '*.[ch]' \) \( -exec grep -q '\$PostgreSQL' {} \; -o -print \) | while read file ; do head -n 1 < $file | grep -q '^/\*' && echo $file; done | xargs -l sed -i -e '1s/^\// /' -e '1i/*\n * $PostgreSQL:$ \n *' find . \( \( -name 'libstemmer' -o -name 'expected' -o -name 'ppport.h' \) -prune \) -o \( -name '*.[ch]' \) \( -exec grep -q '\$PostgreSQL' {} \; -o -print \) | xargs -l sed -i -e '1i/*\n * $PostgreSQL:$ \n */'
2008-05-17 03:28:26 +02:00
/*
Remove cvs keywords from all files.
2010-09-20 22:08:53 +02:00
* contrib/pg_trgm/trgm.h
Add $PostgreSQL$ markers to a lot of files that were missing them. This particular batch was just for *.c and *.h file. The changes were made with the following 2 commands: find . \( \( -name 'libstemmer' -o -name 'expected' -o -name 'ppport.h' \) -prune \) -o \( -name '*.[ch]' \) \( -exec grep -q '\$PostgreSQL' {} \; -o -print \) | while read file ; do head -n 1 < $file | grep -q '^/\*' && echo $file; done | xargs -l sed -i -e '1s/^\// /' -e '1i/*\n * $PostgreSQL:$ \n *' find . \( \( -name 'libstemmer' -o -name 'expected' -o -name 'ppport.h' \) -prune \) -o \( -name '*.[ch]' \) \( -exec grep -q '\$PostgreSQL' {} \; -o -print \) | xargs -l sed -i -e '1i/*\n * $PostgreSQL:$ \n */'
2008-05-17 03:28:26 +02:00
*/
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#ifndef __TRGM_H__
#define __TRGM_H__
#include "access/gist.h"
#include "access/itup.h"
Add strict_word_similarity to pg_trgm module strict_word_similarity is similar to existing word_similarity function but it takes into account word boundaries to compute similarity. Author: Alexander Korotkov Review by: David Steele, Liudmila Mantrova, me Discussion: https://www.postgresql.org/message-id/flat/CY4PR17MB13207ED8310F847CF117EED0D85A0@CY4PR17MB1320.namprd17.prod.outlook.com
2018-03-21 12:57:42 +01:00
#include "access/stratnum.h"
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#include "storage/bufpage.h"
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
/*
* Options ... but note that trgm_regexp.c effectively assumes these values
* of LPADDING and RPADDING.
*/
Pgindent run for 8.0.
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#define LPADDING 2
#define RPADDING 1
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#define KEEPONLYALNUM
Support LIKE and ILIKE index searches via contrib/pg_trgm indexes. Unlike Btree-based LIKE optimization, this works for non-left-anchored search patterns. The effectiveness of the search depends on how many trigrams can be extracted from the pattern. (The worst case, with no trigrams, degrades to a full-table scan, so this isn't a panacea. But it can be very useful.) Alexander Korotkov, reviewed by Jan Urbanski
2011-02-01 03:33:55 +01:00
/*
* Caution: IGNORECASE macro means that trigrams are case-insensitive.
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
* If this macro is disabled, the ~* and ~~* operators must be removed from
* the operator classes, because we can't handle case-insensitive wildcard
* search with case-sensitive trigrams. Failure to do this will result in
* "cannot handle ~*(~~*) with case-sensitive trigrams" errors.
Support LIKE and ILIKE index searches via contrib/pg_trgm indexes. Unlike Btree-based LIKE optimization, this works for non-left-anchored search patterns. The effectiveness of the search depends on how many trigrams can be extracted from the pattern. (The worst case, with no trigrams, degrades to a full-table scan, so this isn't a panacea. But it can be very useful.) Alexander Korotkov, reviewed by Jan Urbanski
2011-02-01 03:33:55 +01:00
*/
Pgindent run for 8.0.
2004-08-29 07:07:03 +02:00
#define IGNORECASE
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#define DIVUNION
Add KNNGIST support to contrib/pg_trgm. Teodor Sigaev, with some revision by Tom
2010-12-04 06:16:21 +01:00
/* operator strategy numbers */
Add strict_word_similarity to pg_trgm module strict_word_similarity is similar to existing word_similarity function but it takes into account word boundaries to compute similarity. Author: Alexander Korotkov Review by: David Steele, Liudmila Mantrova, me Discussion: https://www.postgresql.org/message-id/flat/CY4PR17MB13207ED8310F847CF117EED0D85A0@CY4PR17MB1320.namprd17.prod.outlook.com
2018-03-21 12:57:42 +01:00
#define SimilarityStrategyNumber 1
#define DistanceStrategyNumber 2
#define LikeStrategyNumber 3
#define ILikeStrategyNumber 4
#define RegExpStrategyNumber 5
#define RegExpICaseStrategyNumber 6
#define WordSimilarityStrategyNumber 7
#define WordDistanceStrategyNumber 8
#define StrictWordSimilarityStrategyNumber 9
#define StrictWordDistanceStrategyNumber 10
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
typedef char trgm[3];
#define CMPCHAR(a,b) ( ((a)==(b)) ? 0 : ( ((a)<(b)) ? -1 : 1 ) )
Remove many -Wcast-qual warnings This addresses only those cases that are easy to fix by adding or moving a const qualifier or removing an unnecessary cast. There are many more complicated cases remaining.
2011-09-11 20:54:32 +02:00
#define CMPPCHAR(a,b,i) CMPCHAR( *(((const char*)(a))+i), *(((const char*)(b))+i) )
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#define CMPTRGM(a,b) ( CMPPCHAR(a,b,0) ? CMPPCHAR(a,b,0) : ( CMPPCHAR(a,b,1) ? CMPPCHAR(a,b,1) : CMPPCHAR(a,b,2) ) )
Pgindent run for 8.0.
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#define CPTRGM(a,b) do { \
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
*(((char*)(a))+0) = *(((char*)(b))+0); \
*(((char*)(a))+1) = *(((char*)(b))+1); \
*(((char*)(a))+2) = *(((char*)(b))+2); \
} while(0);
Support of multibyte encoding for pg_trgm
2008-11-12 14:43:54 +01:00
#ifdef KEEPONLYALNUM
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
#define ISWORDCHR(c) (t_isalpha(c) || t_isdigit(c))
Support of multibyte encoding for pg_trgm
2008-11-12 14:43:54 +01:00
#define ISPRINTABLECHAR(a) ( isascii( *(unsigned char*)(a) ) && (isalnum( *(unsigned char*)(a) ) || *(unsigned char*)(a)==' ') )
#else
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
#define ISWORDCHR(c) (!t_isspace(c))
Support of multibyte encoding for pg_trgm
2008-11-12 14:43:54 +01:00
#define ISPRINTABLECHAR(a) ( isascii( *(unsigned char*)(a) ) && isprint( *(unsigned char*)(a) ) )
#endif
Support LIKE and ILIKE index searches via contrib/pg_trgm indexes. Unlike Btree-based LIKE optimization, this works for non-left-anchored search patterns. The effectiveness of the search depends on how many trigrams can be extracted from the pattern. (The worst case, with no trigrams, degrades to a full-table scan, so this isn't a panacea. But it can be very useful.) Alexander Korotkov, reviewed by Jan Urbanski
2011-02-01 03:33:55 +01:00
#define ISPRINTABLETRGM(t) ( ISPRINTABLECHAR( ((char*)(t)) ) && ISPRINTABLECHAR( ((char*)(t))+1 ) && ISPRINTABLECHAR( ((char*)(t))+2 ) )
pgindent run before PG 9.1 beta 1.
2011-04-10 17:42:00 +02:00
#define ISESCAPECHAR(x) (*(x) == '\\') /* Wildcard escape character */
#define ISWILDCARDCHAR(x) (*(x) == '_' || *(x) == '%') /* Wildcard
* meta-character */
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
Pgindent run for 8.0.
2004-08-29 07:07:03 +02:00
typedef struct
{
Fix up several contrib modules that were using varlena datatypes in not-so-obvious ways. I'm not totally sure that I caught everything, but at least now they pass their regression tests with VARSIZE/SET_VARSIZE defined to reverse byte order.
2007-02-28 23:44:38 +01:00
int32 vl_len_; /* varlena header (do not touch directly!) */
Pgindent run for 8.0.
2004-08-29 07:07:03 +02:00
uint8 flag;
Use FLEXIBLE_ARRAY_MEMBER in a bunch more places. Replace some bogus "x[1]" declarations with "x[FLEXIBLE_ARRAY_MEMBER]". Aside from being more self-documenting, this should help prevent bogus warnings from static code analyzers and perhaps compiler misoptimizations. This patch is just a down payment on eliminating the whole problem, but it gets rid of a lot of easy-to-fix cases. Note that the main problem with doing this is that one must no longer rely on computing sizeof(the containing struct), since the result would be compiler-dependent. Instead use offsetof(struct, lastfield). Autoconf also warns against spelling that offsetof(struct, lastfield[0]). Michael Paquier, review and additional fixes by me.
2015-02-20 06:11:42 +01:00
char data[FLEXIBLE_ARRAY_MEMBER];
8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list provided by Andrew.
2009-06-11 16:49:15 +02:00
} TRGM;
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
Fix up several contrib modules that were using varlena datatypes in not-so-obvious ways. I'm not totally sure that I caught everything, but at least now they pass their regression tests with VARSIZE/SET_VARSIZE defined to reverse byte order.
2007-02-28 23:44:38 +01:00
#define TRGMHDRSIZE (VARHDRSZ + sizeof(uint8))
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
/* gist */
#define BITBYTE 8
Pgindent run for 8.0.
2004-08-29 07:07:03 +02:00
#define SIGLENINT 3 /* >122 => key will toast, so very slow!!! */
#define SIGLEN ( sizeof(int)*SIGLENINT )
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
Pgindent run for 8.0.
2004-08-29 07:07:03 +02:00
#define SIGLENBIT (SIGLEN*BITBYTE - 1) /* see makesign */
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
typedef char BITVEC[SIGLEN];
typedef char *BITVECP;
Modify LOOPBYTE/LOOPBIT macros to be more logical; rather than have the for() body passed as a parameter, make the macros act as simple headers to code blocks. This allows pgindent to be run on these files.
2007-11-16 01:13:02 +01:00
#define LOOPBYTE \
for(i=0;i<SIGLEN;i++)
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#define GETBYTE(x,i) ( *( (BITVECP)(x) + (int)( (i) / BITBYTE ) ) )
Support LIKE and ILIKE index searches via contrib/pg_trgm indexes. Unlike Btree-based LIKE optimization, this works for non-left-anchored search patterns. The effectiveness of the search depends on how many trigrams can be extracted from the pattern. (The worst case, with no trigrams, degrades to a full-table scan, so this isn't a panacea. But it can be very useful.) Alexander Korotkov, reviewed by Jan Urbanski
2011-02-01 03:33:55 +01:00
#define GETBITBYTE(x,i) ( (((char)(x)) >> (i)) & 0x01 )
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#define CLRBIT(x,i) GETBYTE(x,i) &= ~( 0x01 << ( (i) % BITBYTE ) )
#define SETBIT(x,i) GETBYTE(x,i) |= ( 0x01 << ( (i) % BITBYTE ) )
#define GETBIT(x,i) ( (GETBYTE(x,i) >> ( (i) % BITBYTE )) & 0x01 )
#define HASHVAL(val) (((unsigned int)(val)) % SIGLENBIT)
#define HASH(sign, val) SETBIT((sign), HASHVAL(val))
Pgindent run for 8.0.
2004-08-29 07:07:03 +02:00
#define ARRKEY 0x01
#define SIGNKEY 0x02
#define ALLISTRUE 0x04
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
#define ISARRKEY(x) ( ((TRGM*)x)->flag & ARRKEY )
Pgindent run for 8.0.
2004-08-29 07:07:03 +02:00
#define ISSIGNKEY(x) ( ((TRGM*)x)->flag & SIGNKEY )
#define ISALLTRUE(x) ( ((TRGM*)x)->flag & ALLISTRUE )
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
Fix up several contrib modules that were using varlena datatypes in not-so-obvious ways. I'm not totally sure that I caught everything, but at least now they pass their regression tests with VARSIZE/SET_VARSIZE defined to reverse byte order.
2007-02-28 23:44:38 +01:00
#define CALCGTSIZE(flag, len) ( TRGMHDRSIZE + ( ( (flag) & ARRKEY ) ? ((len)*sizeof(trgm)) : (((flag) & ALLISTRUE) ? 0 : SIGLEN) ) )
#define GETSIGN(x) ( (BITVECP)( (char*)x+TRGMHDRSIZE ) )
#define GETARR(x) ( (trgm*)( (char*)x+TRGMHDRSIZE ) )
#define ARRNELEM(x) ( ( VARSIZE(x) - TRGMHDRSIZE )/sizeof(trgm) )
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
Add word_similarity to pg_trgm contrib module. Patch introduces a concept of similarity over string and just a word from another string. Version of extension is not changed because 1.2 was already introduced in 9.6 release cycle, so, there wasn't a public version. Author: Alexander Korotkov, Artur Zakirov
2016-03-16 16:59:21 +01:00
/*
* If DIVUNION is defined then similarity formula is:
* count / (len1 + len2 - count)
* else if DIVUNION is not defined then similarity formula is:
* count / max(len1, len2)
*/
#ifdef DIVUNION
#define CALCSML(count, len1, len2) ((float4) (count)) / ((float4) ((len1) + (len2) - (count)))
#else
#define CALCSML(count, len1, len2) ((float4) (count)) / ((float4) (((len1) > (len2)) ? (len1) : (len2)))
#endif
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
typedef struct TrgmPackedGraph TrgmPackedGraph;
GUC variable pg_trgm.similarity_threshold insead of set_limit() Use GUC variable pg_trgm.similarity_threshold insead of set_limit()/show_limit() which was introduced when defining GUC varuables by modules was absent. Author: Artur Zakirov
2016-03-16 15:44:58 +01:00
extern double similarity_threshold;
Add word_similarity to pg_trgm contrib module. Patch introduces a concept of similarity over string and just a word from another string. Version of extension is not changed because 1.2 was already introduced in 9.6 release cycle, so, there wasn't a public version. Author: Alexander Korotkov, Artur Zakirov
2016-03-16 16:59:21 +01:00
extern double word_similarity_threshold;
Add strict_word_similarity to pg_trgm module strict_word_similarity is similar to existing word_similarity function but it takes into account word boundaries to compute similarity. Author: Alexander Korotkov Review by: David Steele, Liudmila Mantrova, me Discussion: https://www.postgresql.org/message-id/flat/CY4PR17MB13207ED8310F847CF117EED0D85A0@CY4PR17MB1320.namprd17.prod.outlook.com
2018-03-21 12:57:42 +01:00
extern double strict_word_similarity_threshold;
Fix up several contrib modules that were using varlena datatypes in not-so-obvious ways. I'm not totally sure that I caught everything, but at least now they pass their regression tests with VARSIZE/SET_VARSIZE defined to reverse byte order.
2007-02-28 23:44:38 +01:00
Add strict_word_similarity to pg_trgm module strict_word_similarity is similar to existing word_similarity function but it takes into account word boundaries to compute similarity. Author: Alexander Korotkov Review by: David Steele, Liudmila Mantrova, me Discussion: https://www.postgresql.org/message-id/flat/CY4PR17MB13207ED8310F847CF117EED0D85A0@CY4PR17MB1320.namprd17.prod.outlook.com
2018-03-21 12:57:42 +01:00
extern double index_strategy_get_limit(StrategyNumber strategy);
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
extern uint32 trgm2int(trgm *ptr);
extern void compact_trigram(trgm *tptr, char *str, int bytelen);
extern TRGM *generate_trgm(char *str, int slen);
extern TRGM *generate_wildcard_trgm(const char *str, int slen);
Add word_similarity to pg_trgm contrib module. Patch introduces a concept of similarity over string and just a word from another string. Version of extension is not changed because 1.2 was already introduced in 9.6 release cycle, so, there wasn't a public version. Author: Alexander Korotkov, Artur Zakirov
2016-03-16 16:59:21 +01:00
extern float4 cnt_sml(TRGM *trg1, TRGM *trg2, bool inexact);
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
extern bool trgm_contained_by(TRGM *trg1, TRGM *trg2);
Make contrib/pg_trgm also support regex searches with GiST indexes. This wasn't addressed in the original patch, but it doesn't take very much additional code to cover the case, so let's get it done. Since pg_trgm 1.1 hasn't been released yet, I just changed the definition of what's in it, rather than inventing a 1.2.
2013-04-10 19:30:14 +02:00
extern bool *trgm_presence_map(TRGM *query, TRGM *key);
extern TRGM *createTrgmNFA(text *text_re, Oid collation,
Phase 2 pgindent run for v12. Switch to 2.1 version of pg_bsd_indent. This formats multiline function declarations "correctly", that is with additional lines of parameter declarations indented to match where the first line's left parenthesis is. Discussion: https://postgr.es/m/CAEepm=0P3FeTXRcU5B2W3jv3PgRVZ-kGUXLGfd42FFhUROO3ug@mail.gmail.com
2019-05-22 19:04:48 +02:00
TrgmPackedGraph **graph, MemoryContext rcontext);
Support indexing of regular-expression searches in contrib/pg_trgm. This works by extracting trigrams from the given regular expression, in generally the same spirit as the previously-existing support for LIKE searches, though of course the details are far more complicated. Currently, only GIN indexes are supported. We might be able to make it work with GiST indexes later. The implementation includes adding API functions to backend/regex/ to provide a view of the search NFA created from a regular expression. These functions are meant to be generic enough to be supportable in a standalone version of the regex library, should that ever happen. Alexander Korotkov, reviewed by Heikki Linnakangas and Tom Lane
2013-04-09 07:05:55 +02:00
extern bool trigramsMatchGraph(TrgmPackedGraph *graph, bool *check);
trgm - Trigram matching for PostgreSQL -------------------------------------- The pg_trgm contrib module provides functions and index classes for determining the similarity of text based on trigram matching.
2004-05-31 19:18:12 +02:00
Phase 2 of pgindent updates. Change pg_bsd_indent to follow upstream rules for placement of comments to the right of code, and remove pgindent hack that caused comments following #endif to not obey the general rule. Commit e3860ffa4dd0dad0dd9eea4be9cc1412373a8c89 wasn't actually using the published version of pg_bsd_indent, but a hacked-up version that tried to minimize the amount of movement of comments to the right of code. The situation of interest is where such a comment has to be moved to the right of its default placement at column 33 because there's code there. BSD indent has always moved right in units of tab stops in such cases --- but in the previous incarnation, indent was working in 8-space tab stops, while now it knows we use 4-space tabs. So the net result is that in about half the cases, such comments are placed one tab stop left of before. This is better all around: it leaves more room on the line for comment text, and it means that in such cases the comment uniformly starts at the next 4-space tab stop after the code, rather than sometimes one and sometimes two tabs after. Also, ensure that comments following #endif are indented the same as comments following other preprocessor commands such as #else. That inconsistency turns out to have been self-inflicted damage from a poorly-thought-through post-indent "fixup" in pgindent. This patch is much less interesting than the first round of indent changes, but also bulkier, so I thought it best to separate the effects. Discussion: https://postgr.es/m/E1dAmxK-0006EE-1r@gemulon.postgresql.org Discussion: https://postgr.es/m/30527.1495162840@sss.pgh.pa.us
2017-06-21 21:18:54 +02:00
#endif /* __TRGM_H__ */