On 12.02.2016 20:56, Teodor Sigaev wrote:
On Thu, Feb 11, 2016 at 9:56 AM, Teodor Sigaev <teo...@sigaev.ru> wrote:
1 - sml_limit to similarity_limit. sml_threshold is difficult to
write I
think,
similarity_limit is more simple.
It seems to me that threshold is right word by meaning. sml_threshold
is my
choice.
Why abbreviate it like that? Nobody's going to know that "sml" stands
for "similarity" without consulting the documentation, and that sucks.
Ok, I don't have an objections. I worked a lot on various similarity
modules and sml becomes usual for me. That's why I was asking.
Hi!
I attached new version of the patch. It fixes names of GUC variables and
functions.
Now the patch introduces:
1 - functions:
- word_similarity()
2 - operators:
- %> (and <%)
- <->> (and <<->)
3 - GUC variables:
- pg_trgm.similarity_threshold
- pg_trgm.word_similarity_threshold
--
Artur Zakirov
Postgres Professional: http://www.postgrespro.com
Russian Postgres Company
*** a/contrib/pg_trgm/pg_trgm--1.2.sql
--- b/contrib/pg_trgm/pg_trgm--1.2.sql
***************
*** 3,13 ****
--- 3,15 ----
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION pg_trgm" to load this file. \quit
+ -- Deprecated function
CREATE FUNCTION set_limit(float4)
RETURNS float4
AS 'MODULE_PATHNAME'
LANGUAGE C STRICT VOLATILE;
+ -- Deprecated function
CREATE FUNCTION show_limit()
RETURNS float4
AS 'MODULE_PATHNAME'
***************
*** 26,32 **** LANGUAGE C STRICT IMMUTABLE;
CREATE FUNCTION similarity_op(text,text)
RETURNS bool
AS 'MODULE_PATHNAME'
! LANGUAGE C STRICT STABLE; -- stable because depends on trgm_limit
CREATE OPERATOR % (
LEFTARG = text,
--- 28,34 ----
CREATE FUNCTION similarity_op(text,text)
RETURNS bool
AS 'MODULE_PATHNAME'
! LANGUAGE C STRICT STABLE; -- stable because depends on pg_trgm.similarity_threshold
CREATE OPERATOR % (
LEFTARG = text,
*** a/contrib/pg_trgm/trgm.h
--- b/contrib/pg_trgm/trgm.h
***************
*** 105,111 **** typedef char *BITVECP;
typedef struct TrgmPackedGraph TrgmPackedGraph;
! extern float4 trgm_limit;
extern uint32 trgm2int(trgm *ptr);
extern void compact_trigram(trgm *tptr, char *str, int bytelen);
--- 105,111 ----
typedef struct TrgmPackedGraph TrgmPackedGraph;
! extern double similarity_threshold;
extern uint32 trgm2int(trgm *ptr);
extern void compact_trigram(trgm *tptr, char *str, int bytelen);
*** a/contrib/pg_trgm/trgm_gin.c
--- b/contrib/pg_trgm/trgm_gin.c
***************
*** 206,212 **** gin_trgm_consistent(PG_FUNCTION_ARGS)
* similarity is just c / len1.
* So, independly on DIVUNION the upper bound formula is the same.
*/
! res = (nkeys == 0) ? false : ((((((float4) ntrue) / ((float4) nkeys))) >= trgm_limit) ? true : false);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
--- 206,214 ----
* similarity is just c / len1.
* So, independly on DIVUNION the upper bound formula is the same.
*/
! res = (nkeys == 0) ? false :
! ((((((float4) ntrue) / ((float4) nkeys))) >= similarity_threshold)
! ? true : false);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
***************
*** 283,289 **** gin_trgm_triconsistent(PG_FUNCTION_ARGS)
/*
* See comment in gin_trgm_consistent() about * upper bound formula
*/
! res = (nkeys == 0) ? GIN_FALSE : (((((float4) ntrue) / ((float4) nkeys)) >= trgm_limit) ? GIN_MAYBE : GIN_FALSE);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
--- 285,293 ----
/*
* See comment in gin_trgm_consistent() about * upper bound formula
*/
! res = (nkeys == 0) ? GIN_FALSE :
! (((((float4) ntrue) / ((float4) nkeys)) >= similarity_threshold)
! ? GIN_MAYBE : GIN_FALSE);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
*** a/contrib/pg_trgm/trgm_gist.c
--- b/contrib/pg_trgm/trgm_gist.c
***************
*** 294,300 **** gtrgm_consistent(PG_FUNCTION_ARGS)
float4 tmpsml = cnt_sml(key, qtrg);
/* strange bug at freebsd 5.2.1 and gcc 3.3.3 */
! res = (*(int *) &tmpsml == *(int *) &trgm_limit || tmpsml > trgm_limit) ? true : false;
}
else if (ISALLTRUE(key))
{ /* non-leaf contains signature */
--- 294,301 ----
float4 tmpsml = cnt_sml(key, qtrg);
/* strange bug at freebsd 5.2.1 and gcc 3.3.3 */
! res = (*(int *) &tmpsml == *(int *) &similarity_threshold
! || tmpsml > similarity_threshold) ? true : false;
}
else if (ISALLTRUE(key))
{ /* non-leaf contains signature */
***************
*** 308,314 **** gtrgm_consistent(PG_FUNCTION_ARGS)
if (len == 0)
res = false;
else
! res = (((((float8) count) / ((float8) len))) >= trgm_limit) ? true : false;
}
break;
case ILikeStrategyNumber:
--- 309,316 ----
if (len == 0)
res = false;
else
! res = (((((float8) count) / ((float8) len))) >= similarity_threshold)
! ? true : false;
}
break;
case ILikeStrategyNumber:
*** a/contrib/pg_trgm/trgm_op.c
--- b/contrib/pg_trgm/trgm_op.c
***************
*** 14,20 ****
PG_MODULE_MAGIC;
! float4 trgm_limit = 0.3f;
PG_FUNCTION_INFO_V1(set_limit);
PG_FUNCTION_INFO_V1(show_limit);
--- 14,23 ----
PG_MODULE_MAGIC;
! /* GUC variables */
! double similarity_threshold = 0.3f;
!
! void _PG_init(void);
PG_FUNCTION_INFO_V1(set_limit);
PG_FUNCTION_INFO_V1(show_limit);
***************
*** 23,44 **** PG_FUNCTION_INFO_V1(similarity);
PG_FUNCTION_INFO_V1(similarity_dist);
PG_FUNCTION_INFO_V1(similarity_op);
Datum
set_limit(PG_FUNCTION_ARGS)
{
float4 nlimit = PG_GETARG_FLOAT4(0);
if (nlimit < 0 || nlimit > 1.0)
! elog(ERROR, "wrong limit, should be between 0 and 1");
! trgm_limit = nlimit;
! PG_RETURN_FLOAT4(trgm_limit);
}
Datum
show_limit(PG_FUNCTION_ARGS)
{
! PG_RETURN_FLOAT4(trgm_limit);
}
static int
--- 26,77 ----
PG_FUNCTION_INFO_V1(similarity_dist);
PG_FUNCTION_INFO_V1(similarity_op);
+ /*
+ * Module load callback
+ */
+ void
+ _PG_init(void)
+ {
+ /* Define custom GUC variables. */
+ DefineCustomRealVariable("pg_trgm.similarity_threshold",
+ "Sets the threshold used by the %% operator.",
+ "Valid range is 0.0 .. 1.0.",
+ &similarity_threshold,
+ 0.3,
+ 0.0,
+ 1.0,
+ PGC_USERSET,
+ 0,
+ NULL,
+ NULL,
+ NULL);
+ }
+ /*
+ * Deprecated function.
+ * Use "pg_trgm.similarity_threshold" GUC variable instead of this function
+ */
Datum
set_limit(PG_FUNCTION_ARGS)
{
float4 nlimit = PG_GETARG_FLOAT4(0);
if (nlimit < 0 || nlimit > 1.0)
! ereport(ERROR,
! (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
! errmsg("wrong limit, should be between 0 and 1")));
! similarity_threshold = nlimit;
! PG_RETURN_FLOAT4(similarity_threshold);
}
+ /*
+ * Deprecated function.
+ * Use "pg_trgm.similarity_threshold" GUC variable instead of this function
+ */
Datum
show_limit(PG_FUNCTION_ARGS)
{
! PG_RETURN_FLOAT4(similarity_threshold);
}
static int
***************
*** 720,724 **** similarity_op(PG_FUNCTION_ARGS)
PG_GETARG_DATUM(0),
PG_GETARG_DATUM(1)));
! PG_RETURN_BOOL(res >= trgm_limit);
}
--- 753,757 ----
PG_GETARG_DATUM(0),
PG_GETARG_DATUM(1)));
! PG_RETURN_BOOL(res >= similarity_threshold);
}
*** a/doc/src/sgml/pgtrgm.sgml
--- b/doc/src/sgml/pgtrgm.sgml
***************
*** 99,105 ****
Returns the current similarity threshold used by the <literal>%</>
operator. This sets the minimum similarity between
two words for them to be considered similar enough to
! be misspellings of each other, for example.
</entry>
</row>
<row>
--- 99,106 ----
Returns the current similarity threshold used by the <literal>%</>
operator. This sets the minimum similarity between
two words for them to be considered similar enough to
! be misspellings of each other, for example
! (<emphasis>deprecated</emphasis>).
</entry>
</row>
<row>
***************
*** 108,114 ****
<entry>
Sets the current similarity threshold that is used by the <literal>%</>
operator. The threshold must be between 0 and 1 (default is 0.3).
! Returns the same value passed in.
</entry>
</row>
</tbody>
--- 109,115 ----
<entry>
Sets the current similarity threshold that is used by the <literal>%</>
operator. The threshold must be between 0 and 1 (default is 0.3).
! Returns the same value passed in (<emphasis>deprecated</emphasis>).
</entry>
</row>
</tbody>
***************
*** 133,139 ****
<entry>
Returns <literal>true</> if its arguments have a similarity that is
greater than the current similarity threshold set by
! <function>set_limit</>.
</entry>
</row>
<row>
--- 134,140 ----
<entry>
Returns <literal>true</> if its arguments have a similarity that is
greater than the current similarity threshold set by
! <varname>pg_trgm.similarity_threshold</>.
</entry>
</row>
<row>
***************
*** 150,155 ****
--- 151,177 ----
</sect2>
<sect2>
+ <title>GUC Parameters</title>
+
+ <variablelist>
+ <varlistentry id="guc-pgtrgm-similarity-threshold" xreflabel="pg_trgm.similarity_threshold">
+ <term>
+ <varname>pg_trgm.similarity_threshold</> (<type>real</type>)
+ <indexterm>
+ <primary><varname>pg_trgm.similarity_threshold</> configuration parameter</primary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ Sets the current similarity threshold that is used by the <literal>%</>
+ operator. The threshold must be between 0 and 1 (default is 0.3).
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </sect2>
+
+ <sect2>
<title>Index Support</title>
<para>
*** a/contrib/pg_trgm/Makefile
--- b/contrib/pg_trgm/Makefile
***************
*** 7,13 **** EXTENSION = pg_trgm
DATA = pg_trgm--1.2.sql pg_trgm--1.0--1.1.sql pg_trgm--1.1--1.2.sql pg_trgm--unpackaged--1.0.sql
PGFILEDESC = "pg_trgm - trigram matching"
! REGRESS = pg_trgm
ifdef USE_PGXS
PG_CONFIG = pg_config
--- 7,13 ----
DATA = pg_trgm--1.2.sql pg_trgm--1.0--1.1.sql pg_trgm--1.1--1.2.sql pg_trgm--unpackaged--1.0.sql
PGFILEDESC = "pg_trgm - trigram matching"
! REGRESS = pg_trgm pg_word_trgm
ifdef USE_PGXS
PG_CONFIG = pg_config
*** /dev/null
--- b/contrib/pg_trgm/data/trgm2.data
***************
*** 0 ****
--- 1,696 ----
+ Baikal
+ Baikaluobbal
+ Lake Baikal
+ Baikalakko
+ Baikal Business Centre
+ Baikal Listvyanka Hotel
+ Baikal Airfield
+ Baikalovo
+ Transbaikalia
+ Baikal Mountains
+ Baikal Hotel Moscow
+ Zabaikalie
+ Pribaikalskaya
+ Baikal Plaza
+ Rubaikale
+ Tandobai Algad
+ Daikalay
+ Bakall
+ Stubaital
+ Neustift im Stubaital
+ Anonyme Appartments Stubaital
+ Barkaladja Pool
+ Awabakal Nature Reserve
+ Awabakal Field Studies Centre
+ Barkala
+ Bailallie
+ Barkala Park
+ Purba Kalaujan
+ Nabakalas
+ Barkal
+ Baikanthapur
+ Baikarjhuti
+ Baika
+ Baikari
+ Bakalia Char
+ Dakshin Bakalia
+ Purba Kalmegha
+ Efreytor-Bakalovo
+ Baykalsko
+ Baykal
+ Baskaltsi
+ Bakalite
+ Bajkal
+ Efrejtor Bakalovo
+ Kampong Bakaladong
+ Riacho do Sambaibal
+ Sambaibal
+ Barkalabava
+ Zabaykal
+ Bakalar Lake
+ Kaikalahun Indian Reserve 25
+ Tumba-Kalamba
+ Kamba-Kalele
+ Boyagbakala
+ Bombakalo
+ Batikalengbe
+ Bakalukudu
+ Bakalawa
+ Bakala
+ Matamba-Kalenge
+ Kusu-Bakali
+ Kambakala
+ Bakali
+ Abakalu
+ Bonagbakala
+ Bakalua
+ Bikala Madila
+ Bikala
+ Bumba-Kaloki
+ Tumba-Kalunga
+ Kabankala
+ Mambakala
+ Tumba-Kalumba
+ Kabakala
+ Bikalabwa
+ Bomba-Kalende
+ Mwalaba-Kalamba
+ Matamba-Kalenga
+ Bumba-Kalumba
+ Bikalange
+ Kabikala
+ Mubikale
+ Kanampumba-Kalawa
+ Tshiabakale
+ Bakaly
+ Bakalongo
+ Bakale
+ Bakala Koupi
+ Bambakala
+ Bakalou
+ Tsibakala
+ Kimbakala
+ Dabakalakoro
+ Dabakala
+ Bakalafoulou
+ Ngao Bakala
+ Mobaika
+ Baimalou
+ Xibaitaling
+ Baikai
+ Baikang
+ Baitaling
+ Baikan
+ Baimaling Linchang
+ Baimalong
+ Baikanzui
+ Baiyali
+ Baimaling
+ Baimalang Donggang
+ Baikangshuoma
+ Baitaliao
+ Taikale
+ Babainale
+ Bailale
+ Baibale
+ Baiwale
+ Baikangnei
+ Baitali
+ Xiabaikan
+ Bailalong
+ Baimaluo
+ Baikacun
+ Baisala
+ Bailalin
+ Baimala
+ Baidalong
+ Dabaika
+ Caikalong
+ Cuobaikacun
+ Baikadangcun
+ Baimalin
+ Subaika
+ Gabakkale
+ Barkallou
+ Embatkala
+ Bodega Tabaibal
+ Golba Kalo
+ Haikala
+ Kaikale
+ Waikaloulevu
+ Waikalou Creek
+ Waikalou
+ Ndelaikalou
+ Ndelaikalokalo
+ Bay of Backaland
+ Bankali
+ Ker Samba Kalla
+ Demba Kali
+ Bakalarr
+ Baipal
+ Kalibakalako
+ Dalabakala
+ Bikal
+ Sembaikan
+ Praikalogu
+ Tanjung Ompaikalio
+ Bonebabakal
+ Tanjung Batikala
+ Pulau Bakalanpauno
+ Teluk Bakalan
+ Bakaltua Bank
+ Bakalrejo
+ Bakalan
+ Sungai Bakaladiyan
+ Bakal
+ Buku Baikole
+ Pulau Baika
+ Tanjung Bakalinga
+ Pulau Bakalan
+ Desa Bakalan
+ Kebakkalang
+ Ngambakalang
+ Mota Sabakal
+ Bakalan Lor
+ Babakalo
+ Buyu Rapanbakalai
+ Kalimundubakalan
+ Bakalpokok
+ Bakaldukuh
+ Tanabakal
+ Tanjung Aikaluin
+ Desa Bakalrejo
+ Bakalan Kidul
+ Desa Kebakalan
+ Kebakalan
+ Bakalan Kulon
+ Gunung Bakalan
+ Kalibakal
+ Bakaljaya
+ Trobakal
+ Bakalan Wetan
+ Desa Bakal
+ Alue Bakkala
+ Uruk Bakal
+ Bakalbuah
+ Kwala Bakala
+ Bakal Lama
+ Bakal Julu
+ Bakal Batu
+ Moncong Baika
+ Sampangbakalan
+ Bakalam
+ Desa Bakalankrapyak
+ Lebakkalapa Tonggoh
+ Trembakal
+ Bakalan Tengah
+ Kali Bakalan
+ Desa Cemengbakalan
+ Desa Bakalanpule
+ Gunung Bakal
+ Desa Tambakkalisogo
+ Tambakkalisogo
+ Desa Bakalanrayung
+ Salu Bakalaeng
+ Bakalaeng
+ Danau Bakalan
+ Selat Bakalan
+ Selat Bakalanpauno
+ Laikalanda
+ Bakalinga
+ Tanjung Mbakalang
+ Desa Bakalankrajan
+ Bakalan Dua
+ Kali Purbakala
+ Desa Bakalanwringinpitu
+ Tukad Kubakal
+ Praikalangga
+ Banjar Kubakal
+ Eat Bakal
+ Sungai Bakala
+ Kombakalada
+ Sori Rabakalo
+ Kahambikalela
+ Baikarara
+ Baikapaka
+ Tukad Bakalan
+ Teluk Haludubakal
+ Yabakalewa
+ Praikalumbang
+ Waikalowo
+ Praikalubu
+ Loko Praikalubu
+ Ramuk Ombakalada
+ Praikalebung
+ Praikaleka
+ Andabakal
+ Praikalau
+ Praikalokat
+ Praikalimbung
+ Bambakalo
+ Leubakkalian
+ Pematang Baitalimbangan
+ Lebakalil
+ Gereba Kaler
+ Krajan Bakalan
+ Bakalan Barat
+ Muarabakal
+ Umbulan Maharobakal
+ Bakaldalam
+ Talang Bakal
+ Pematang Bakalpanang
+ Baidaloen
+ Jatibakal
+ Tubu Bakalekuk
+ Dola Peimambakal
+ Bakalang
+ Teluk Bakalang
+ Salu Baidale
+ Bakalerek
+ Ile Bakalibu
+ Parbakalan
+ Praikalembu
+ Palindi Laikali
+ Praikalu
+ Sori Labakalate
+ Air Bakal-kecil
+ Sungaikalung
+ Sungaikalong
+ Pematang Bakalpanjang
+ Payabakal
+ Waikala
+ Sungaikali
+ Sungai Pebakalan
+ Parit Membakal
+ Bakalpakebo
+ Baikat Abu Jaraban
+ Maikalganj
+ Maikala Range
+ Bakalha
+ Baitalpur
+ Baikanthpur
+ Baihal
+ Barkala Reserved Forest
+ Babaipalli
+ Kaikalapettai
+ Kambainallur
+ Bakkalale
+ Kaikalui
+ Baijalpur
+ Nehalla Bankalah Reserved Forest
+ Barkala Rao
+ Barkali
+ Baidal
+ Barkaleh
+ Darreh Pumba Kal
+ Bahkalleh
+ Wibakale
+ Gaikali
+ Gagaba Kalo
+ Barkalare
+ Bakkalmal
+ Gora Bakalyadyr
+ Rodnik Bakalybulak
+ Urochishche Bakaly
+ Sopka Bakaly
+ Gory Bakaly
+ Bugor Arba-Kalgan
+ Ozero Baykal
+ Kolodets Tabakkalgan
+ Walangivattu Vaikal
+ Vattevaikal Anicut
+ Vaikali Tevar Kulam
+ Vaikalitevan Kulam
+ Vaikaladichchenai
+ Uchchodaikallu
+ Sellapattu Vaikal
+ Savata Vaikal
+ Puttadivali Vaikal
+ Palukadu Vaikal
+ Mulaikallu Kulam
+ Koraikallimadu
+ Koraikalapu Kulam
+ Karaiyamullivaikal
+ Karaivaikal Kulam
+ Kanawali Vaikal
+ Habakkala
+ Chalam Vaikal Aru
+ Ambakala Wewa
+ Alaikallupoddakulam
+ Alaikallupodda Alankulam
+ Akamadi Vaikal
+ Alaikalluppodda Kulam
+ Vaikaliththevakulam
+ Baikole
+ Sidi Mohammed el Bakali
+ Sidi Mohammed Bakkal
+ Sidi Bakal
+ Oulad el Bakkal
+ Zaouia Oulad Bakal
+ Azib el Bakkali
+ Tombakala
+ Malaikaly
+ Ambadikala
+ Bakalica
+ Bakalnica
+ Abankala
+ Kombakala
+ Bawkalut
+ Bakaleko
+ Bawkalut Chaung
+ Baukala
+ Cerro Bainaltzin
+ Sungai Bakal
+ Bukit Ubaibalih
+ Kampong Sombakal
+ Kampung Lebai Ali
+ Batikal
+ Bakalalan Airport
+ Maikali
+ Bakalum
+ Bakalambani
+ Abakaliki
+ Tsaunin Maikalaji
+ Baikaha
+ Llano Limbaika
+ Barkald
+ Barkald stasjon
+ Barkaleitet
+ Barkaldfossen
+ Barkaldvola
+ Bakkalegskardet
+ Baikajavri
+ Barkalden
+ Bakkalia
+ Siljabaika
+ Aikaluokta
+ Blombakkali
+ Bavkalasis
+ Baikajohka
+ Bakkalykkja
+ Bakalauri
+ Bakalauri1
+ Bakalauri2
+ Bakalauri3
+ Bakalauri4
+ Bakalauri5
+ Bakalauri6
+ Bakalauri7
+ Bakalauri8
+ Bakalauri9
+ Bakalsen
+ Baiyaldi
+ Naikala
+ Baikanda
+ Barkalne
+ Bakalipur
+ Bakaldum
+ Raikal
+ Baikatte
+ Maikal
+ Bakalbhar
+ Waikalabubu Bay
+ Baikai Island
+ Abikal
+ Boikalakalawa Bay
+ Maikal River
+ Bakalao Asibi Point
+ Bankal
+ Bakalod Island
+ Bakalao Point
+ Bakalan River
+ Bakal Dos
+ Bakal Uno
+ Daang Bakal
+ Bankal School
+ Bakal Tres
+ Kabankalan City Public Plaza
+ Ranra Tabai Algad
+ Bairkal Jabal
+ Bairkal Dhora
+ Bairkal
+ Zaibai Algad
+ Gulba Kalle
+ Ragha Bakalzai
+ Dabbarkal Sar
+ Tabai Algad
+ Haikalzai
+ Wuchobai Algad
+ Jabba Kalai
+ Goth Soba Kaloi
+ Baikar Tsarai
+ Dudgaikal
+ Baixale Kamar
+ Zebai Algad
+ Bakal Khel
+ Goth Haikal
+ Haikal
+ Jaba Kalle
+ Bakalovina
+ Salabaikasy
+ Guba Kalita
+ Guba Kalgalaksha
+ Guba Kaldo
+ Bakalovo
+ Baykalovo
+ Baskalino
+ Sopka Barkaleptskaya
+ Bakalovskaya Ferma
+ Bakalinskiy Rayon
+ Sovkhoz Bakalinskiy
+ Bakalinskiy
+ Bakaldy
+ Bakaldinskoye
+ Urochishche Bakaldikha
+ Zabaykalovskiy
+ Barkalova
+ Barkalovka
+ Gora Barkalova
+ Gora Barkalyu
+ Bikalamakhi
+ Stantsiya Bakal
+ Baykalovskiy Rayon
+ Baykalovskiy
+ Baykalovsk
+ Bakalda
+ Boloto Malyy Baykal
+ Boloto Baykal
+ Zabaykalka
+ Stantsiya Baykal
+ Baykalo-Amurskaya Zheleznaya Doroga
+ Kolkhoz Krasnyy Baykal
+ Zaliv Baykal
+ Bakalino
+ Ovrag Bakalda
+ Bakaldovshchina
+ Prud Novyy Baykal
+ Bakaleyka
+ Bakalka
+ Bakaly TV Mast
+ Urochishche Bakalovo
+ Kambaika
+ Maloye Baykalovo
+ Bakalinskiy Leskhoz
+ Bikalikha
+ Kordon Barkalo
+ Sanatoriy Baykal
+ Port Baykal
+ Baykalikha
+ Polevoy Stan Baykal
+ Bakalovka
+ Ramada Makkah Shubaika
+ Mount Tohebakala
+ Tambakale Island
+ Mbanitambaika Island
+ Mbakalaka Island
+ Kumbakale
+ Kaikaloka
+ Kelesaikal
+ Nasb Gabakallah
+ Jabal Barkal
+ Jabal Abakallah
+ Al Barkali
+ Shabakal Abbass
+ Mabaikuli
+ Bambakalema
+ Bambakalia
+ Baiwala
+ Babakalia
+ Baikama
+ Bankalol
+ Kundebakali
+ Yumbaikamadu
+ Tabakali
+ Daba Kalharereh
+ Barkale
+ Bakalshile
+ Bakaloolay
+ Buur Bakaley
+ Bakaley
+ Buur Bakale
+ Bakalaale
+ Jabal Mobakali
+ Khor Bakallii
+ Korombaital
+ Ambakali
+ Ba Kaliin
+ Mbay Bakala
+ Tagobikala
+ Fayzabadkala
+ Aghbai Allazy
+ Aghbai Alikagar
+ Gora Fayzabadkala
+ Daraikalot
+ Aghbai Alakisirak
+ Beikala
+ Foho Berbakalau
+ Mota Caicabaisala
+ Sungai Utabailale
+ Urochishche Bakalarnyn-Ayasy
+ Urochishche Batkali
+ Khrebet Batkali
+ Ras Barkallah
+ Babakale
+ Fabrikalar
+ Bakalukalu Shan
+ Bakalukalu
+ Laikala
+ Waikalakaka
+ Columbus Bakalar Municipal Airport
+ Bakalar Library
+ Bakkala Cemetery
+ Clifton T Barkalow Elementary School
+ Barkalow Hollow
+ Kailuapuhi Waikalua Homesteads
+ Kawaikalia Gulch
+ Waikalae
+ Waikaloa Stream
+ Waikalua-Loko Fish Pond
+ Halekou Waikaluakai Homesteads
+ East Waikalua
+ Omar Haikal Islamic Academy
+ Bakalar Air Force Base (historical)
+ Koshbakaly
+ Bagkalen
+ Gora Baikara
+ Mfumbaika
+ Mbakalungu
+ Chumbaika
+ Ntombankala School
+ Bakalabwa Pans
+ Khobai al Janhra
+ Holiday Inn Dubai Al Barsha
+ Novotel Dubai Al Barsha
+ Doubletree Res.Dubai-Al Barsha
+ Doubletree By Hilton Hotel and Apartments Dubai Al Barsha
+ Doubletree By Hilton Dubai Al Barsha Hotel and Res
+ Park Inn By Radisson Dubai Al Barsha
+ Ramee Rose Hotel Dubai Al Barsha
+ Aparthotel Adagio Premium Dubai Al Barsha
+ Ataikala
+ Selman Marrakech
+ Riad Ain Marrakech
+ Taj Palace Marrakech
+ Delano Marrakech
+ Pullman Marrakech Palmeraie Resort And Spa
+ Lalla Calipau Marrakech
+ Hotel Fashion Marrakech
+ Four Seasons Resort Marrakech
+ Adama Resort Marrakech
+ Pullman Marrakech Palmeraie Re
+ Ramada Resort Marrakech Douar Al Hana
+ Hotel Zahia Marrakech
+ Hotel Marrakech Le Tichka
+ Le Chems Marrakech
+ Beachcomber Royal Palm Marrakech
+ Residence Marrakech
+ Riad Hermes Marrakech
+ Riad La Lune De Marrakech
+ Hotel Marrakech Le Sangho Privilege
+ Tempoo Hotel Marrakech
+ Ag Hotel & Spa Marrakech
+ Palm Appart Club Marrakech
+ Hotel Ibis Moussafir Marrakech Palmeraie
+ Ibis Marrakech Gare Voyageurs
+ Marrakech Ryads Parc And Spa
+ Terra Mia Marrakech Riad
+ Residence Dar Lamia Marrakech
+ Pullman Marrakech Palmeraie Rs
+ Moussaf Marrakech Centre Gare
+ Tempoo Hotel Marrakech Adults Only
+ Sahara Palace Marrakech
+ Moroccan House Marrakech
+ El Andalouss And Spa Marrakech
+ Suite Novotel Marrakech Rs
+ Dar Catalina Marrakech Hotel Non Refundable Room
+ Marrakech Hotel
+ Oued Tammarrakech
+ Tammarrakech
+ Cercle de Marrakech-Banlieue
+ Marrakech-Tensift-Al Haouz
+ Koudia Marrakech
+ Hotel Tichka Salam Marrakech
+ L'Atlas Marrakech
+ Royal Mirage Deluxe Marrakech
+ Golden Tulip Farah Marrakech
+ Ryad Mogador Marrakech
+ Coralia Club Marrakech Palmariva
+ La Sultana Marrakech
+ Marrakech-Medina
+ Marrakech
+ Museum of Marrakech
+ Douar Marrakechiyinc
+ Ibis Marrakech Centre Gare
+ Golden Tulip Rawabi Marrakech
+ Murano Resort Marrakech
+ Marrakech Garden Hotel
+ Pullman Marrakech Palmerai Resort & Spa
+ The Pearl Marrakech
+ Palais Calipau Marrakech
+ Hostal Equity Point Marrakech
+ Sofitel Marrakech Lounge And Spa
+ Pullman Marrakech Hotel And Spa
+ Sofitel Marrakech Palais Imperial
+ Hotel Ibis Moussafir Marrakech Centre Gare
+ Red Hotel Marrakech
+ Riad Zenith Marrakech
+ Ksar Catalina Marrakech Hotel
+ Blue Sea Hotel Marrakech Ryads Parc & Spa
+ Bluebay Marrakech
+ Pullman Marrakech Palmeraie Resort & Spa Hotel
+ Riad Litzy Marrakech
+ Sultana Hotel & Spa Marrakech
+ Albatros Club Marrakech
+ Hotel Sangho Club Marrakech
+ Suite Novotel Marrakech Hotel
+ Riad Utopia Suites & Spa Marrakech
+ Riad Fatinat Marrakech
+ Riad Dar El Aila Marrakech
+ Es Saadi And Casino De Marrakech
+ Dar Catalina Marrakech Hotel
+ Grace Marrakech
+ Marrakesh Apartments
+ Marrakesh Country Club
+ Koudiat Lmerrakechiyine
+ Sidi Mohammed el Marrakchi
+ Marrakesh
+ Marrakchien
+ Marrakchia
+ Marrakesh Menara Airport
+ Marrakesh Hua Hin Resort & Spa
+ Marrakesh Hua Hin Resort And Spa
+ Marrakesh Resort And Spa (Pool Suite)
+ Marrakesh Huahin Resort & Spa
+ Ibis Moussafir Marrakesh Centre Gare Hotel
+ Maerak-chi
+ Dar Hammou Ben Merrakchi
+ Lalla el Marakchia
+ Khrebet Marrakh
+ Sungai Maru Kechil
+ Marrache
+ Goth Marracha
+ Maramech Hill
+ Maramech Woods Nature Preserve
+ Oued Karakech
+ Samarra School
+ Jangal-e Marakeh Sar
*** a/contrib/pg_trgm/expected/pg_trgm.out
--- b/contrib/pg_trgm/expected/pg_trgm.out
***************
*** 59,65 **** select similarity('---', '####---');
0
(1 row)
! CREATE TABLE test_trgm(t text);
\copy test_trgm from 'data/trgm.data'
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
t | sml
--- 59,65 ----
0
(1 row)
! CREATE TABLE test_trgm(t text COLLATE "C");
\copy test_trgm from 'data/trgm.data'
select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
t | sml
***************
*** 3467,3473 **** select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu198
qwertyu0988 | 0.333333
(1 row)
! create table test2(t text);
insert into test2 values ('abcdef');
insert into test2 values ('quark');
insert into test2 values (' z foo bar');
--- 3467,3473 ----
qwertyu0988 | 0.333333
(1 row)
! create table test2(t text COLLATE "C");
insert into test2 values ('abcdef');
insert into test2 values ('quark');
insert into test2 values (' z foo bar');
*** /dev/null
--- b/contrib/pg_trgm/expected/pg_word_trgm.out
***************
*** 0 ****
--- 1,1044 ----
+ CREATE TABLE test_trgm2(t text COLLATE "C");
+ \copy test_trgm2 from 'data/trgm2.data'
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ (20 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ t | sml
+ ------------------------------+-----
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ (4 rows)
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ (20 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+ t | sml
+ ------------------------------+-----
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ (4 rows)
+
+ select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7;
+ ?column? | t
+ ----------+----------------------------------
+ 0 | Kabankala
+ 0.1 | Kabankalan City Public Plaza
+ 0.3 | Abankala
+ 0.4 | Ntombankala School
+ 0.416667 | Kabakala
+ 0.5 | Nehalla Bankalah Reserved Forest
+ 0.538462 | Kabikala
+ (7 rows)
+
+ create index trgm_idx2 on test_trgm2 using gist (t gist_trgm_ops);
+ set enable_seqscan=off;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ (20 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ t | sml
+ ------------------------------+-----
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ (4 rows)
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ (20 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+ t | sml
+ ------------------------------+-----
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ (4 rows)
+
+ explain (costs off)
+ select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7;
+ QUERY PLAN
+ ------------------------------------------------
+ Limit
+ -> Index Scan using trgm_idx2 on test_trgm2
+ Order By: (t <->> 'Kabankala'::text)
+ (3 rows)
+
+ select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7;
+ ?column? | t
+ ----------+----------------------------------
+ 0 | Kabankala
+ 0.1 | Kabankalan City Public Plaza
+ 0.3 | Abankala
+ 0.4 | Ntombankala School
+ 0.416667 | Kabakala
+ 0.5 | Nehalla Bankalah Reserved Forest
+ 0.538462 | Kabikala
+ (7 rows)
+
+ drop index trgm_idx2;
+ create index trgm_idx2 on test_trgm2 using gin (t gin_trgm_ops);
+ set enable_seqscan=off;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ (20 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ t | sml
+ ------------------------------+-----
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ (4 rows)
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ (20 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+ t | sml
+ ------------------------------+-----
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ (4 rows)
+
+ set "pg_trgm.word_similarity_threshold" to 0.5;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ Bakal Batu | 0.571429
+ Zabaykalka | 0.571429
+ Zabaykalovskiy | 0.571429
+ (23 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ t | sml
+ ----------------------------------+----------
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ Kabakala | 0.583333
+ Nehalla Bankalah Reserved Forest | 0.5
+ (6 rows)
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ t | sml
+ -------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ Bakal Batu | 0.571429
+ Zabaykalka | 0.571429
+ Zabaykalovskiy | 0.571429
+ (23 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+ t | sml
+ ----------------------------------+----------
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ Kabakala | 0.583333
+ Nehalla Bankalah Reserved Forest | 0.5
+ (6 rows)
+
+ set "pg_trgm.word_similarity_threshold" to 0.3;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ t | sml
+ -----------------------------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ Bakal Batu | 0.571429
+ Zabaykalka | 0.571429
+ Zabaykalovskiy | 0.571429
+ Air Bakal-kecil | 0.444444
+ Bakal | 0.444444
+ Bakal Dos | 0.444444
+ Bakal Julu | 0.444444
+ Bakal Khel | 0.444444
+ Bakal Lama | 0.444444
+ Bakal Tres | 0.444444
+ Bakal Uno | 0.444444
+ Daang Bakal | 0.444444
+ Desa Bakal | 0.444444
+ Eat Bakal | 0.444444
+ Gunung Bakal | 0.444444
+ Sidi Bakal | 0.444444
+ Stantsiya Bakal | 0.444444
+ Sungai Bakal | 0.444444
+ Talang Bakal | 0.444444
+ Uruk Bakal | 0.444444
+ Zaouia Oulad Bakal | 0.444444
+ Al Barkali | 0.428571
+ Aparthotel Adagio Premium Dubai Al Barsha | 0.428571
+ Baikal Business Centre | 0.428571
+ Bay of Backaland | 0.428571
+ Boikalakalawa Bay | 0.428571
+ Doubletree By Hilton Dubai Al Barsha Hotel and Res | 0.428571
+ Doubletree By Hilton Hotel and Apartments Dubai Al Barsha | 0.428571
+ Doubletree Res.Dubai-Al Barsha | 0.428571
+ Holiday Inn Dubai Al Barsha | 0.428571
+ Jabal Barkal | 0.428571
+ Novotel Dubai Al Barsha | 0.428571
+ Park Inn By Radisson Dubai Al Barsha | 0.428571
+ Ramee Rose Hotel Dubai Al Barsha | 0.428571
+ Waikalabubu Bay | 0.428571
+ Baikal | 0.4
+ Baikal Airfield | 0.4
+ Baikal Hotel Moscow | 0.4
+ Baikal Listvyanka Hotel | 0.4
+ Baikal Mountains | 0.4
+ Baikal Plaza | 0.4
+ Bajkal | 0.4
+ Bankal | 0.4
+ Bankal School | 0.4
+ Barkal | 0.4
+ Lake Baikal | 0.4
+ Mbay Bakala | 0.4
+ Oulad el Bakkal | 0.4
+ Sidi Mohammed Bakkal | 0.4
+ Bairkal | 0.363636
+ Bairkal Dhora | 0.363636
+ Bairkal Jabal | 0.363636
+ Batikal | 0.363636
+ Bakala | 0.333333
+ Bakala Koupi | 0.333333
+ Bakalaale | 0.333333
+ Bakalabwa Pans | 0.333333
+ Bakalaeng | 0.333333
+ Bakalafoulou | 0.333333
+ Bakalalan Airport | 0.333333
+ Bakalam | 0.333333
+ Bakalambani | 0.333333
+ Bakalan | 0.333333
+ Bakalan Barat | 0.333333
+ Bakalan Dua | 0.333333
+ Bakalan Kidul | 0.333333
+ Bakalan Kulon | 0.333333
+ Bakalan Lor | 0.333333
+ Bakalan River | 0.333333
+ Bakalan Tengah | 0.333333
+ Bakalan Wetan | 0.333333
+ Bakalang | 0.333333
+ Bakalao Asibi Point | 0.333333
+ Bakalao Point | 0.333333
+ Bakalar Air Force Base (historical) | 0.333333
+ Bakalar Lake | 0.333333
+ Bakalar Library | 0.333333
+ Bakalarr | 0.333333
+ Bakalauri | 0.333333
+ Bakalauri1 | 0.333333
+ Bakalauri2 | 0.333333
+ Bakalauri3 | 0.333333
+ Bakalauri4 | 0.333333
+ Bakalauri5 | 0.333333
+ Bakalauri6 | 0.333333
+ Bakalauri7 | 0.333333
+ Bakalauri8 | 0.333333
+ Bakalauri9 | 0.333333
+ Bakalawa | 0.333333
+ Bakalbhar | 0.333333
+ Bakalbuah | 0.333333
+ Bakalda | 0.333333
+ Bakaldalam | 0.333333
+ Bakaldinskoye | 0.333333
+ Bakaldovshchina | 0.333333
+ Bakaldukuh | 0.333333
+ Bakaldum | 0.333333
+ Bakaldy | 0.333333
+ Bakale | 0.333333
+ Bakaleko | 0.333333
+ Bakalerek | 0.333333
+ Bakaley | 0.333333
+ Bakaleyka | 0.333333
+ Bakalha | 0.333333
+ Bakali | 0.333333
+ Bakalia Char | 0.333333
+ Bakalica | 0.333333
+ Bakalinga | 0.333333
+ Bakalino | 0.333333
+ Bakalinskiy | 0.333333
+ Bakalinskiy Leskhoz | 0.333333
+ Bakalinskiy Rayon | 0.333333
+ Bakalipur | 0.333333
+ Bakalite | 0.333333
+ Bakaljaya | 0.333333
+ Bakalka | 0.333333
+ Bakall | 0.333333
+ Bakalnica | 0.333333
+ Bakalod Island | 0.333333
+ Bakalongo | 0.333333
+ Bakaloolay | 0.333333
+ Bakalou | 0.333333
+ Bakalovina | 0.333333
+ Bakalovka | 0.333333
+ Bakalovo | 0.333333
+ Bakalovskaya Ferma | 0.333333
+ Bakalpakebo | 0.333333
+ Bakalpokok | 0.333333
+ Bakalrejo | 0.333333
+ Bakalsen | 0.333333
+ Bakalshile | 0.333333
+ Bakaltua Bank | 0.333333
+ Bakalua | 0.333333
+ Bakalukalu | 0.333333
+ Bakalukalu Shan | 0.333333
+ Bakalukudu | 0.333333
+ Bakalum | 0.333333
+ Bakaly | 0.333333
+ Bakaly TV Mast | 0.333333
+ Buur Bakale | 0.333333
+ Buur Bakaley | 0.333333
+ Columbus Bakalar Municipal Airport | 0.333333
+ Dakshin Bakalia | 0.333333
+ Danau Bakalan | 0.333333
+ Desa Bakalan | 0.333333
+ Desa Bakalankrajan | 0.333333
+ Desa Bakalankrapyak | 0.333333
+ Desa Bakalanpule | 0.333333
+ Desa Bakalanrayung | 0.333333
+ Desa Bakalanwringinpitu | 0.333333
+ Desa Bakalrejo | 0.333333
+ Efrejtor Bakalovo | 0.333333
+ Efreytor-Bakalovo | 0.333333
+ Gora Bakalyadyr | 0.333333
+ Gory Bakaly | 0.333333
+ Gunung Bakalan | 0.333333
+ Ile Bakalibu | 0.333333
+ Kali Bakalan | 0.333333
+ Kampong Bakaladong | 0.333333
+ Khor Bakallii | 0.333333
+ Krajan Bakalan | 0.333333
+ Kusu-Bakali | 0.333333
+ Kwala Bakala | 0.333333
+ Ngao Bakala | 0.333333
+ Ovrag Bakalda | 0.333333
+ Pematang Bakalpanang | 0.333333
+ Pematang Bakalpanjang | 0.333333
+ Pulau Bakalan | 0.333333
+ Pulau Bakalanpauno | 0.333333
+ Ragha Bakalzai | 0.333333
+ Rodnik Bakalybulak | 0.333333
+ Salu Bakalaeng | 0.333333
+ Selat Bakalan | 0.333333
+ Selat Bakalanpauno | 0.333333
+ Sidi Mohammed el Bakali | 0.333333
+ Sopka Bakaly | 0.333333
+ Sovkhoz Bakalinskiy | 0.333333
+ Sungai Bakala | 0.333333
+ Sungai Bakaladiyan | 0.333333
+ Tanjung Bakalinga | 0.333333
+ Teluk Bakalan | 0.333333
+ Teluk Bakalang | 0.333333
+ Tubu Bakalekuk | 0.333333
+ Tukad Bakalan | 0.333333
+ Urochishche Bakalarnyn-Ayasy | 0.333333
+ Urochishche Bakaldikha | 0.333333
+ Urochishche Bakalovo | 0.333333
+ Urochishche Bakaly | 0.333333
+ Bakkalmal | 0.307692
+ Alue Bakkala | 0.3
+ Azib el Bakkali | 0.3
+ Ba Kaliin | 0.3
+ Bagkalen | 0.3
+ Bahkalleh | 0.3
+ Baikalakko | 0.3
+ Baikalovo | 0.3
+ Baikaluobbal | 0.3
+ Bakkala Cemetery | 0.3
+ Bakkalale | 0.3
+ Bakkalegskardet | 0.3
+ Bakkalia | 0.3
+ Bakkalykkja | 0.3
+ Bankali | 0.3
+ Bankalol | 0.3
+ Barkala | 0.3
+ Barkala Park | 0.3
+ Barkala Rao | 0.3
+ Barkala Reserved Forest | 0.3
+ Barkalabava | 0.3
+ Barkaladja Pool | 0.3
+ Barkalare | 0.3
+ Barkald | 0.3
+ Barkald stasjon | 0.3
+ Barkalden | 0.3
+ Barkaldfossen | 0.3
+ Barkaldvola | 0.3
+ Barkale | 0.3
+ Barkaleh | 0.3
+ Barkaleitet | 0.3
+ Barkali | 0.3
+ Barkallou | 0.3
+ Barkalne | 0.3
+ Barkalova | 0.3
+ Barkalovka | 0.3
+ Barkalow Hollow | 0.3
+ Baskalino | 0.3
+ Baskaltsi | 0.3
+ Baukala | 0.3
+ Bavkalasis | 0.3
+ Bawkalut | 0.3
+ Bawkalut Chaung | 0.3
+ Bikal | 0.3
+ Clifton T Barkalow Elementary School | 0.3
+ Gora Barkalova | 0.3
+ Gora Barkalyu | 0.3
+ Khrebet Batkali | 0.3
+ Kordon Barkalo | 0.3
+ Nehalla Bankalah Reserved Forest | 0.3
+ Ras Barkallah | 0.3
+ Sopka Barkaleptskaya | 0.3
+ Urochishche Batkali | 0.3
+ (261 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ t | sml
+ ----------------------------------+----------
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ Kabakala | 0.583333
+ Nehalla Bankalah Reserved Forest | 0.5
+ Kabikala | 0.461538
+ Mwalaba-Kalamba | 0.454545
+ Bakala Koupi | 0.4
+ Bankal | 0.4
+ Bankal School | 0.4
+ Bankali | 0.4
+ Bankalol | 0.4
+ Jabba Kalai | 0.4
+ Kanampumba-Kalawa | 0.4
+ Purba Kalaujan | 0.4
+ Tumba-Kalamba | 0.4
+ Daba Kalharereh | 0.363636
+ Gagaba Kalo | 0.363636
+ Jaba Kalle | 0.363636
+ Dabakala | 0.333333
+ Dalabakala | 0.333333
+ Kambakala | 0.333333
+ Ker Samba Kalla | 0.333333
+ Fayzabadkala | 0.307692
+ Gora Fayzabadkala | 0.307692
+ Guba Kalgalaksha | 0.307692
+ Habakkala | 0.307692
+ Kaikalahun Indian Reserve 25 | 0.307692
+ Kaikalapettai | 0.307692
+ Alue Bakkala | 0.3
+ Ambadikala | 0.3
+ Ambakala Wewa | 0.3
+ Ataikala | 0.3
+ Ba Kaliin | 0.3
+ Bakala | 0.3
+ Bakkala Cemetery | 0.3
+ Bambakala | 0.3
+ Barkala | 0.3
+ Barkala Park | 0.3
+ Barkala Rao | 0.3
+ Barkala Reserved Forest | 0.3
+ Baukala | 0.3
+ Beikala | 0.3
+ Bikala | 0.3
+ Bikala Madila | 0.3
+ Bomba-Kalende | 0.3
+ Bonagbakala | 0.3
+ Boyagbakala | 0.3
+ Bugor Arba-Kalgan | 0.3
+ Bumba-Kaloki | 0.3
+ Bumba-Kalumba | 0.3
+ Darreh Pumba Kal | 0.3
+ Demba Kali | 0.3
+ Embatkala | 0.3
+ Gereba Kaler | 0.3
+ Golba Kalo | 0.3
+ Goth Soba Kaloi | 0.3
+ Guba Kaldo | 0.3
+ Guba Kalita | 0.3
+ Gulba Kalle | 0.3
+ Haikala | 0.3
+ Kali Bakalan | 0.3
+ Kali Purbakala | 0.3
+ Kalibakal | 0.3
+ Kalibakalako | 0.3
+ Kalimundubakalan | 0.3
+ Kamba-Kalele | 0.3
+ Kimbakala | 0.3
+ Kombakala | 0.3
+ Kwala Bakala | 0.3
+ Laikala | 0.3
+ Maikala Range | 0.3
+ Mambakala | 0.3
+ Matamba-Kalenga | 0.3
+ Matamba-Kalenge | 0.3
+ Mbay Bakala | 0.3
+ Mount Tohebakala | 0.3
+ Naikala | 0.3
+ Ngao Bakala | 0.3
+ Purba Kalmegha | 0.3
+ Sungai Bakala | 0.3
+ Tagobikala | 0.3
+ Tanjung Batikala | 0.3
+ Tombakala | 0.3
+ Tsibakala | 0.3
+ Tumba-Kalumba | 0.3
+ Tumba-Kalunga | 0.3
+ Waikala | 0.3
+ (89 rows)
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ t | sml
+ -----------------------------------------------------------+----------
+ Baykal | 1
+ Boloto Baykal | 1
+ Boloto Malyy Baykal | 1
+ Kolkhoz Krasnyy Baykal | 1
+ Ozero Baykal | 1
+ Polevoy Stan Baykal | 1
+ Port Baykal | 1
+ Prud Novyy Baykal | 1
+ Sanatoriy Baykal | 1
+ Stantsiya Baykal | 1
+ Zaliv Baykal | 1
+ Baykalikha | 0.857143
+ Baykalo-Amurskaya Zheleznaya Doroga | 0.857143
+ Baykalovo | 0.857143
+ Baykalovsk | 0.857143
+ Baykalovskiy | 0.857143
+ Baykalovskiy Rayon | 0.857143
+ Baykalsko | 0.857143
+ Maloye Baykalovo | 0.857143
+ Zabaykal | 0.714286
+ Bakal Batu | 0.571429
+ Zabaykalka | 0.571429
+ Zabaykalovskiy | 0.571429
+ Air Bakal-kecil | 0.444444
+ Bakal | 0.444444
+ Bakal Dos | 0.444444
+ Bakal Julu | 0.444444
+ Bakal Khel | 0.444444
+ Bakal Lama | 0.444444
+ Bakal Tres | 0.444444
+ Bakal Uno | 0.444444
+ Daang Bakal | 0.444444
+ Desa Bakal | 0.444444
+ Eat Bakal | 0.444444
+ Gunung Bakal | 0.444444
+ Sidi Bakal | 0.444444
+ Stantsiya Bakal | 0.444444
+ Sungai Bakal | 0.444444
+ Talang Bakal | 0.444444
+ Uruk Bakal | 0.444444
+ Zaouia Oulad Bakal | 0.444444
+ Al Barkali | 0.428571
+ Aparthotel Adagio Premium Dubai Al Barsha | 0.428571
+ Baikal Business Centre | 0.428571
+ Bay of Backaland | 0.428571
+ Boikalakalawa Bay | 0.428571
+ Doubletree By Hilton Dubai Al Barsha Hotel and Res | 0.428571
+ Doubletree By Hilton Hotel and Apartments Dubai Al Barsha | 0.428571
+ Doubletree Res.Dubai-Al Barsha | 0.428571
+ Holiday Inn Dubai Al Barsha | 0.428571
+ Jabal Barkal | 0.428571
+ Novotel Dubai Al Barsha | 0.428571
+ Park Inn By Radisson Dubai Al Barsha | 0.428571
+ Ramee Rose Hotel Dubai Al Barsha | 0.428571
+ Waikalabubu Bay | 0.428571
+ Baikal | 0.4
+ Baikal Airfield | 0.4
+ Baikal Hotel Moscow | 0.4
+ Baikal Listvyanka Hotel | 0.4
+ Baikal Mountains | 0.4
+ Baikal Plaza | 0.4
+ Bajkal | 0.4
+ Bankal | 0.4
+ Bankal School | 0.4
+ Barkal | 0.4
+ Lake Baikal | 0.4
+ Mbay Bakala | 0.4
+ Oulad el Bakkal | 0.4
+ Sidi Mohammed Bakkal | 0.4
+ Bairkal | 0.363636
+ Bairkal Dhora | 0.363636
+ Bairkal Jabal | 0.363636
+ Batikal | 0.363636
+ Bakala | 0.333333
+ Bakala Koupi | 0.333333
+ Bakalaale | 0.333333
+ Bakalabwa Pans | 0.333333
+ Bakalaeng | 0.333333
+ Bakalafoulou | 0.333333
+ Bakalalan Airport | 0.333333
+ Bakalam | 0.333333
+ Bakalambani | 0.333333
+ Bakalan | 0.333333
+ Bakalan Barat | 0.333333
+ Bakalan Dua | 0.333333
+ Bakalan Kidul | 0.333333
+ Bakalan Kulon | 0.333333
+ Bakalan Lor | 0.333333
+ Bakalan River | 0.333333
+ Bakalan Tengah | 0.333333
+ Bakalan Wetan | 0.333333
+ Bakalang | 0.333333
+ Bakalao Asibi Point | 0.333333
+ Bakalao Point | 0.333333
+ Bakalar Air Force Base (historical) | 0.333333
+ Bakalar Lake | 0.333333
+ Bakalar Library | 0.333333
+ Bakalarr | 0.333333
+ Bakalauri | 0.333333
+ Bakalauri1 | 0.333333
+ Bakalauri2 | 0.333333
+ Bakalauri3 | 0.333333
+ Bakalauri4 | 0.333333
+ Bakalauri5 | 0.333333
+ Bakalauri6 | 0.333333
+ Bakalauri7 | 0.333333
+ Bakalauri8 | 0.333333
+ Bakalauri9 | 0.333333
+ Bakalawa | 0.333333
+ Bakalbhar | 0.333333
+ Bakalbuah | 0.333333
+ Bakalda | 0.333333
+ Bakaldalam | 0.333333
+ Bakaldinskoye | 0.333333
+ Bakaldovshchina | 0.333333
+ Bakaldukuh | 0.333333
+ Bakaldum | 0.333333
+ Bakaldy | 0.333333
+ Bakale | 0.333333
+ Bakaleko | 0.333333
+ Bakalerek | 0.333333
+ Bakaley | 0.333333
+ Bakaleyka | 0.333333
+ Bakalha | 0.333333
+ Bakali | 0.333333
+ Bakalia Char | 0.333333
+ Bakalica | 0.333333
+ Bakalinga | 0.333333
+ Bakalino | 0.333333
+ Bakalinskiy | 0.333333
+ Bakalinskiy Leskhoz | 0.333333
+ Bakalinskiy Rayon | 0.333333
+ Bakalipur | 0.333333
+ Bakalite | 0.333333
+ Bakaljaya | 0.333333
+ Bakalka | 0.333333
+ Bakall | 0.333333
+ Bakalnica | 0.333333
+ Bakalod Island | 0.333333
+ Bakalongo | 0.333333
+ Bakaloolay | 0.333333
+ Bakalou | 0.333333
+ Bakalovina | 0.333333
+ Bakalovka | 0.333333
+ Bakalovo | 0.333333
+ Bakalovskaya Ferma | 0.333333
+ Bakalpakebo | 0.333333
+ Bakalpokok | 0.333333
+ Bakalrejo | 0.333333
+ Bakalsen | 0.333333
+ Bakalshile | 0.333333
+ Bakaltua Bank | 0.333333
+ Bakalua | 0.333333
+ Bakalukalu | 0.333333
+ Bakalukalu Shan | 0.333333
+ Bakalukudu | 0.333333
+ Bakalum | 0.333333
+ Bakaly | 0.333333
+ Bakaly TV Mast | 0.333333
+ Buur Bakale | 0.333333
+ Buur Bakaley | 0.333333
+ Columbus Bakalar Municipal Airport | 0.333333
+ Dakshin Bakalia | 0.333333
+ Danau Bakalan | 0.333333
+ Desa Bakalan | 0.333333
+ Desa Bakalankrajan | 0.333333
+ Desa Bakalankrapyak | 0.333333
+ Desa Bakalanpule | 0.333333
+ Desa Bakalanrayung | 0.333333
+ Desa Bakalanwringinpitu | 0.333333
+ Desa Bakalrejo | 0.333333
+ Efrejtor Bakalovo | 0.333333
+ Efreytor-Bakalovo | 0.333333
+ Gora Bakalyadyr | 0.333333
+ Gory Bakaly | 0.333333
+ Gunung Bakalan | 0.333333
+ Ile Bakalibu | 0.333333
+ Kali Bakalan | 0.333333
+ Kampong Bakaladong | 0.333333
+ Khor Bakallii | 0.333333
+ Krajan Bakalan | 0.333333
+ Kusu-Bakali | 0.333333
+ Kwala Bakala | 0.333333
+ Ngao Bakala | 0.333333
+ Ovrag Bakalda | 0.333333
+ Pematang Bakalpanang | 0.333333
+ Pematang Bakalpanjang | 0.333333
+ Pulau Bakalan | 0.333333
+ Pulau Bakalanpauno | 0.333333
+ Ragha Bakalzai | 0.333333
+ Rodnik Bakalybulak | 0.333333
+ Salu Bakalaeng | 0.333333
+ Selat Bakalan | 0.333333
+ Selat Bakalanpauno | 0.333333
+ Sidi Mohammed el Bakali | 0.333333
+ Sopka Bakaly | 0.333333
+ Sovkhoz Bakalinskiy | 0.333333
+ Sungai Bakala | 0.333333
+ Sungai Bakaladiyan | 0.333333
+ Tanjung Bakalinga | 0.333333
+ Teluk Bakalan | 0.333333
+ Teluk Bakalang | 0.333333
+ Tubu Bakalekuk | 0.333333
+ Tukad Bakalan | 0.333333
+ Urochishche Bakalarnyn-Ayasy | 0.333333
+ Urochishche Bakaldikha | 0.333333
+ Urochishche Bakalovo | 0.333333
+ Urochishche Bakaly | 0.333333
+ Bakkalmal | 0.307692
+ Alue Bakkala | 0.3
+ Azib el Bakkali | 0.3
+ Ba Kaliin | 0.3
+ Bagkalen | 0.3
+ Bahkalleh | 0.3
+ Baikalakko | 0.3
+ Baikalovo | 0.3
+ Baikaluobbal | 0.3
+ Bakkala Cemetery | 0.3
+ Bakkalale | 0.3
+ Bakkalegskardet | 0.3
+ Bakkalia | 0.3
+ Bakkalykkja | 0.3
+ Bankali | 0.3
+ Bankalol | 0.3
+ Barkala | 0.3
+ Barkala Park | 0.3
+ Barkala Rao | 0.3
+ Barkala Reserved Forest | 0.3
+ Barkalabava | 0.3
+ Barkaladja Pool | 0.3
+ Barkalare | 0.3
+ Barkald | 0.3
+ Barkald stasjon | 0.3
+ Barkalden | 0.3
+ Barkaldfossen | 0.3
+ Barkaldvola | 0.3
+ Barkale | 0.3
+ Barkaleh | 0.3
+ Barkaleitet | 0.3
+ Barkali | 0.3
+ Barkallou | 0.3
+ Barkalne | 0.3
+ Barkalova | 0.3
+ Barkalovka | 0.3
+ Barkalow Hollow | 0.3
+ Baskalino | 0.3
+ Baskaltsi | 0.3
+ Baukala | 0.3
+ Bavkalasis | 0.3
+ Bawkalut | 0.3
+ Bawkalut Chaung | 0.3
+ Bikal | 0.3
+ Clifton T Barkalow Elementary School | 0.3
+ Gora Barkalova | 0.3
+ Gora Barkalyu | 0.3
+ Khrebet Batkali | 0.3
+ Kordon Barkalo | 0.3
+ Nehalla Bankalah Reserved Forest | 0.3
+ Ras Barkallah | 0.3
+ Sopka Barkaleptskaya | 0.3
+ Urochishche Batkali | 0.3
+ (261 rows)
+
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+ t | sml
+ ----------------------------------+----------
+ Kabankala | 1
+ Kabankalan City Public Plaza | 0.9
+ Abankala | 0.7
+ Ntombankala School | 0.6
+ Kabakala | 0.583333
+ Nehalla Bankalah Reserved Forest | 0.5
+ Kabikala | 0.461538
+ Mwalaba-Kalamba | 0.454545
+ Bakala Koupi | 0.4
+ Bankal | 0.4
+ Bankal School | 0.4
+ Bankali | 0.4
+ Bankalol | 0.4
+ Jabba Kalai | 0.4
+ Kanampumba-Kalawa | 0.4
+ Purba Kalaujan | 0.4
+ Tumba-Kalamba | 0.4
+ Daba Kalharereh | 0.363636
+ Gagaba Kalo | 0.363636
+ Jaba Kalle | 0.363636
+ Dabakala | 0.333333
+ Dalabakala | 0.333333
+ Kambakala | 0.333333
+ Ker Samba Kalla | 0.333333
+ Fayzabadkala | 0.307692
+ Gora Fayzabadkala | 0.307692
+ Guba Kalgalaksha | 0.307692
+ Habakkala | 0.307692
+ Kaikalahun Indian Reserve 25 | 0.307692
+ Kaikalapettai | 0.307692
+ Alue Bakkala | 0.3
+ Ambadikala | 0.3
+ Ambakala Wewa | 0.3
+ Ataikala | 0.3
+ Ba Kaliin | 0.3
+ Bakala | 0.3
+ Bakkala Cemetery | 0.3
+ Bambakala | 0.3
+ Barkala | 0.3
+ Barkala Park | 0.3
+ Barkala Rao | 0.3
+ Barkala Reserved Forest | 0.3
+ Baukala | 0.3
+ Beikala | 0.3
+ Bikala | 0.3
+ Bikala Madila | 0.3
+ Bomba-Kalende | 0.3
+ Bonagbakala | 0.3
+ Boyagbakala | 0.3
+ Bugor Arba-Kalgan | 0.3
+ Bumba-Kaloki | 0.3
+ Bumba-Kalumba | 0.3
+ Darreh Pumba Kal | 0.3
+ Demba Kali | 0.3
+ Embatkala | 0.3
+ Gereba Kaler | 0.3
+ Golba Kalo | 0.3
+ Goth Soba Kaloi | 0.3
+ Guba Kaldo | 0.3
+ Guba Kalita | 0.3
+ Gulba Kalle | 0.3
+ Haikala | 0.3
+ Kali Bakalan | 0.3
+ Kali Purbakala | 0.3
+ Kalibakal | 0.3
+ Kalibakalako | 0.3
+ Kalimundubakalan | 0.3
+ Kamba-Kalele | 0.3
+ Kimbakala | 0.3
+ Kombakala | 0.3
+ Kwala Bakala | 0.3
+ Laikala | 0.3
+ Maikala Range | 0.3
+ Mambakala | 0.3
+ Matamba-Kalenga | 0.3
+ Matamba-Kalenge | 0.3
+ Mbay Bakala | 0.3
+ Mount Tohebakala | 0.3
+ Naikala | 0.3
+ Ngao Bakala | 0.3
+ Purba Kalmegha | 0.3
+ Sungai Bakala | 0.3
+ Tagobikala | 0.3
+ Tanjung Batikala | 0.3
+ Tombakala | 0.3
+ Tsibakala | 0.3
+ Tumba-Kalumba | 0.3
+ Tumba-Kalunga | 0.3
+ Waikala | 0.3
+ (89 rows)
+
*** a/contrib/pg_trgm/pg_trgm--1.1--1.2.sql
--- b/contrib/pg_trgm/pg_trgm--1.1--1.2.sql
***************
*** 3,12 ****
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_trgm UPDATE TO '1.2'" to load this file. \quit
CREATE FUNCTION gin_trgm_triconsistent(internal, int2, text, int4, internal, internal, internal)
RETURNS "char"
AS 'MODULE_PATHNAME'
LANGUAGE C IMMUTABLE STRICT;
ALTER OPERATOR FAMILY gin_trgm_ops USING gin ADD
! FUNCTION 6 (text, text) gin_trgm_triconsistent (internal, int2, text, int4, internal, internal, internal);
--- 3,74 ----
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_trgm UPDATE TO '1.2'" to load this file. \quit
+ CREATE FUNCTION word_similarity(text,text)
+ RETURNS float4
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT IMMUTABLE;
+
+ CREATE FUNCTION word_similarity_op(text,text)
+ RETURNS bool
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT STABLE; -- stable because depends on pg_trgm.word_similarity_threshold
+
+ CREATE FUNCTION word_similarity_commutator_op(text,text)
+ RETURNS bool
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT STABLE; -- stable because depends on pg_trgm.word_similarity_threshold
+
+ CREATE FUNCTION word_similarity_dist_op(text,text)
+ RETURNS float4
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT IMMUTABLE;
+
+ CREATE FUNCTION word_similarity_dist_commutator_op(text,text)
+ RETURNS float4
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT IMMUTABLE;
+
+ CREATE OPERATOR <% (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_op,
+ COMMUTATOR = '%>',
+ RESTRICT = contsel,
+ JOIN = contjoinsel
+ );
+
+ CREATE OPERATOR %> (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_commutator_op,
+ COMMUTATOR = '<%',
+ RESTRICT = contsel,
+ JOIN = contjoinsel
+ );
+
+ CREATE OPERATOR <<-> (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_dist_op,
+ COMMUTATOR = '<->>'
+ );
+
+ CREATE OPERATOR <->> (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_dist_commutator_op,
+ COMMUTATOR = '<<->'
+ );
+
CREATE FUNCTION gin_trgm_triconsistent(internal, int2, text, int4, internal, internal, internal)
RETURNS "char"
AS 'MODULE_PATHNAME'
LANGUAGE C IMMUTABLE STRICT;
+ ALTER OPERATOR FAMILY gist_trgm_ops USING gist ADD
+ OPERATOR 7 %> (text, text),
+ OPERATOR 8 <->> (text, text) FOR ORDER BY pg_catalog.float_ops;
+
ALTER OPERATOR FAMILY gin_trgm_ops USING gin ADD
! OPERATOR 7 %> (text, text),
! FUNCTION 6 (text, text) gin_trgm_triconsistent (internal, int2, text, int4, internal, internal, internal);
*** a/contrib/pg_trgm/pg_trgm--1.2.sql
--- b/contrib/pg_trgm/pg_trgm--1.2.sql
***************
*** 39,44 **** CREATE OPERATOR % (
--- 39,77 ----
JOIN = contjoinsel
);
+ CREATE FUNCTION word_similarity(text,text)
+ RETURNS float4
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT IMMUTABLE;
+
+ CREATE FUNCTION word_similarity_op(text,text)
+ RETURNS bool
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT STABLE; -- stable because depends on pg_trgm.word_similarity_threshold
+
+ CREATE FUNCTION word_similarity_commutator_op(text,text)
+ RETURNS bool
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT STABLE; -- stable because depends on pg_trgm.word_similarity_threshold
+
+ CREATE OPERATOR <% (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_op,
+ COMMUTATOR = '%>',
+ RESTRICT = contsel,
+ JOIN = contjoinsel
+ );
+
+ CREATE OPERATOR %> (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_commutator_op,
+ COMMUTATOR = '<%',
+ RESTRICT = contsel,
+ JOIN = contjoinsel
+ );
+
CREATE FUNCTION similarity_dist(text,text)
RETURNS float4
AS 'MODULE_PATHNAME'
***************
*** 51,56 **** CREATE OPERATOR <-> (
--- 84,113 ----
COMMUTATOR = '<->'
);
+ CREATE FUNCTION word_similarity_dist_op(text,text)
+ RETURNS float4
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT IMMUTABLE;
+
+ CREATE FUNCTION word_similarity_dist_commutator_op(text,text)
+ RETURNS float4
+ AS 'MODULE_PATHNAME'
+ LANGUAGE C STRICT IMMUTABLE;
+
+ CREATE OPERATOR <<-> (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_dist_op,
+ COMMUTATOR = '<->>'
+ );
+
+ CREATE OPERATOR <->> (
+ LEFTARG = text,
+ RIGHTARG = text,
+ PROCEDURE = word_similarity_dist_commutator_op,
+ COMMUTATOR = '<<->'
+ );
+
-- gist key
CREATE FUNCTION gtrgm_in(cstring)
RETURNS gtrgm
***************
*** 140,145 **** ALTER OPERATOR FAMILY gist_trgm_ops USING gist ADD
--- 197,208 ----
OPERATOR 5 pg_catalog.~ (text, text),
OPERATOR 6 pg_catalog.~* (text, text);
+ -- Add operators that are new in 9.6 (pg_trgm 1.2).
+
+ ALTER OPERATOR FAMILY gist_trgm_ops USING gist ADD
+ OPERATOR 7 %> (text, text),
+ OPERATOR 8 <->> (text, text) FOR ORDER BY pg_catalog.float_ops;
+
-- support functions for gin
CREATE FUNCTION gin_extract_value_trgm(text, internal)
RETURNS internal
***************
*** 187,190 **** AS 'MODULE_PATHNAME'
--- 250,254 ----
LANGUAGE C IMMUTABLE STRICT;
ALTER OPERATOR FAMILY gin_trgm_ops USING gin ADD
+ OPERATOR 7 %> (text, text),
FUNCTION 6 (text,text) gin_trgm_triconsistent (internal, int2, text, int4, internal, internal, internal);
*** a/contrib/pg_trgm/sql/pg_trgm.sql
--- b/contrib/pg_trgm/sql/pg_trgm.sql
***************
*** 13,19 **** select similarity('wow',' WOW ');
select similarity('---', '####---');
! CREATE TABLE test_trgm(t text);
\copy test_trgm from 'data/trgm.data'
--- 13,19 ----
select similarity('---', '####---');
! CREATE TABLE test_trgm(t text COLLATE "C");
\copy test_trgm from 'data/trgm.data'
***************
*** 40,46 **** select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu098
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
! create table test2(t text);
insert into test2 values ('abcdef');
insert into test2 values ('quark');
insert into test2 values (' z foo bar');
--- 40,46 ----
select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
! create table test2(t text COLLATE "C");
insert into test2 values ('abcdef');
insert into test2 values ('quark');
insert into test2 values (' z foo bar');
*** /dev/null
--- b/contrib/pg_trgm/sql/pg_word_trgm.sql
***************
*** 0 ****
--- 1,42 ----
+ CREATE TABLE test_trgm2(t text COLLATE "C");
+
+ \copy test_trgm2 from 'data/trgm2.data'
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+ select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7;
+
+ create index trgm_idx2 on test_trgm2 using gist (t gist_trgm_ops);
+ set enable_seqscan=off;
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+
+ explain (costs off)
+ select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7;
+ select t <->> 'Kabankala', t from test_trgm2 order by t <->> 'Kabankala' limit 7;
+
+ drop index trgm_idx2;
+ create index trgm_idx2 on test_trgm2 using gin (t gin_trgm_ops);
+ set enable_seqscan=off;
+
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+
+ set "pg_trgm.word_similarity_threshold" to 0.5;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
+
+ set "pg_trgm.word_similarity_threshold" to 0.3;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where 'Baykal' <% t order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where 'Kabankala' <% t order by sml desc, t;
+ select t,word_similarity('Baykal',t) as sml from test_trgm2 where t %> 'Baykal' order by sml desc, t;
+ select t,word_similarity('Kabankala',t) as sml from test_trgm2 where t %> 'Kabankala' order by sml desc, t;
*** a/contrib/pg_trgm/trgm.h
--- b/contrib/pg_trgm/trgm.h
***************
*** 26,38 ****
#define DIVUNION
/* operator strategy numbers */
! #define SimilarityStrategyNumber 1
! #define DistanceStrategyNumber 2
! #define LikeStrategyNumber 3
! #define ILikeStrategyNumber 4
! #define RegExpStrategyNumber 5
! #define RegExpICaseStrategyNumber 6
!
typedef char trgm[3];
--- 26,39 ----
#define DIVUNION
/* operator strategy numbers */
! #define SimilarityStrategyNumber 1
! #define DistanceStrategyNumber 2
! #define LikeStrategyNumber 3
! #define ILikeStrategyNumber 4
! #define RegExpStrategyNumber 5
! #define RegExpICaseStrategyNumber 6
! #define WordSimilarityStrategyNumber 7
! #define WordDistanceStrategyNumber 8
typedef char trgm[3];
***************
*** 103,117 **** typedef char *BITVECP;
#define GETARR(x) ( (trgm*)( (char*)x+TRGMHDRSIZE ) )
#define ARRNELEM(x) ( ( VARSIZE(x) - TRGMHDRSIZE )/sizeof(trgm) )
typedef struct TrgmPackedGraph TrgmPackedGraph;
extern double similarity_threshold;
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);
! extern float4 cnt_sml(TRGM *trg1, TRGM *trg2);
extern bool trgm_contained_by(TRGM *trg1, TRGM *trg2);
extern bool *trgm_presence_map(TRGM *query, TRGM *key);
extern TRGM *createTrgmNFA(text *text_re, Oid collation,
--- 104,131 ----
#define GETARR(x) ( (trgm*)( (char*)x+TRGMHDRSIZE ) )
#define ARRNELEM(x) ( ( VARSIZE(x) - TRGMHDRSIZE )/sizeof(trgm) )
+ /*
+ * 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
+
typedef struct TrgmPackedGraph TrgmPackedGraph;
extern double similarity_threshold;
+ extern double word_similarity_threshold;
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);
! extern float4 cnt_sml(TRGM *trg1, TRGM *trg2, bool inexact);
extern bool trgm_contained_by(TRGM *trg1, TRGM *trg2);
extern bool *trgm_presence_map(TRGM *query, TRGM *key);
extern TRGM *createTrgmNFA(text *text_re, Oid collation,
*** a/contrib/pg_trgm/trgm_gin.c
--- b/contrib/pg_trgm/trgm_gin.c
***************
*** 89,94 **** gin_extract_query_trgm(PG_FUNCTION_ARGS)
--- 89,95 ----
switch (strategy)
{
case SimilarityStrategyNumber:
+ case WordSimilarityStrategyNumber:
trg = generate_trgm(VARDATA(val), VARSIZE(val) - VARHDRSZ);
break;
case ILikeStrategyNumber:
***************
*** 176,181 **** gin_trgm_consistent(PG_FUNCTION_ARGS)
--- 177,183 ----
bool res;
int32 i,
ntrue;
+ double nlimit;
/* All cases served by this function are inexact */
*recheck = true;
***************
*** 183,188 **** gin_trgm_consistent(PG_FUNCTION_ARGS)
--- 185,194 ----
switch (strategy)
{
case SimilarityStrategyNumber:
+ case WordSimilarityStrategyNumber:
+ nlimit = (strategy == SimilarityStrategyNumber) ?
+ similarity_threshold : word_similarity_threshold;
+
/* Count the matches */
ntrue = 0;
for (i = 0; i < nkeys; i++)
***************
*** 207,214 **** gin_trgm_consistent(PG_FUNCTION_ARGS)
* So, independly on DIVUNION the upper bound formula is the same.
*/
res = (nkeys == 0) ? false :
! ((((((float4) ntrue) / ((float4) nkeys))) >= similarity_threshold)
! ? true : false);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
--- 213,219 ----
* So, independly on DIVUNION the upper bound formula is the same.
*/
res = (nkeys == 0) ? false :
! (((((float4) ntrue) / ((float4) nkeys))) >= nlimit);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
***************
*** 270,279 **** gin_trgm_triconsistent(PG_FUNCTION_ARGS)
--- 275,289 ----
int32 i,
ntrue;
bool *boolcheck;
+ double nlimit;
switch (strategy)
{
case SimilarityStrategyNumber:
+ case WordSimilarityStrategyNumber:
+ nlimit = (strategy == SimilarityStrategyNumber) ?
+ similarity_threshold : word_similarity_threshold;
+
/* Count the matches */
ntrue = 0;
for (i = 0; i < nkeys; i++)
***************
*** 285,293 **** gin_trgm_triconsistent(PG_FUNCTION_ARGS)
/*
* See comment in gin_trgm_consistent() about * upper bound formula
*/
! res = (nkeys == 0) ? GIN_FALSE :
! (((((float4) ntrue) / ((float4) nkeys)) >= similarity_threshold)
! ? GIN_MAYBE : GIN_FALSE);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
--- 295,303 ----
/*
* See comment in gin_trgm_consistent() about * upper bound formula
*/
! res = (nkeys == 0)
! ? GIN_FALSE : (((((float4) ntrue) / ((float4) nkeys)) >= nlimit)
! ? GIN_MAYBE : GIN_FALSE);
break;
case ILikeStrategyNumber:
#ifndef IGNORECASE
*** a/contrib/pg_trgm/trgm_gist.c
--- b/contrib/pg_trgm/trgm_gist.c
***************
*** 191,196 **** gtrgm_consistent(PG_FUNCTION_ARGS)
--- 191,197 ----
bool res;
Size querysize = VARSIZE(query);
gtrgm_consistent_cache *cache;
+ double nlimit;
/*
* We keep the extracted trigrams in cache, because trigram extraction is
***************
*** 218,223 **** gtrgm_consistent(PG_FUNCTION_ARGS)
--- 219,225 ----
switch (strategy)
{
case SimilarityStrategyNumber:
+ case WordSimilarityStrategyNumber:
qtrg = generate_trgm(VARDATA(query),
querysize - VARHDRSZ);
break;
***************
*** 286,301 **** gtrgm_consistent(PG_FUNCTION_ARGS)
switch (strategy)
{
case SimilarityStrategyNumber:
! /* Similarity search is exact */
! *recheck = false;
if (GIST_LEAF(entry))
{ /* all leafs contains orig trgm */
! float4 tmpsml = cnt_sml(key, qtrg);
/* strange bug at freebsd 5.2.1 and gcc 3.3.3 */
! res = (*(int *) &tmpsml == *(int *) &similarity_threshold
! || tmpsml > similarity_threshold) ? true : false;
}
else if (ISALLTRUE(key))
{ /* non-leaf contains signature */
--- 288,310 ----
switch (strategy)
{
case SimilarityStrategyNumber:
! case WordSimilarityStrategyNumber:
! /* Similarity search is exact. Word similarity search is inexact */
! *recheck = (strategy == WordSimilarityStrategyNumber);
! nlimit = (strategy == SimilarityStrategyNumber) ?
! similarity_threshold : word_similarity_threshold;
if (GIST_LEAF(entry))
{ /* all leafs contains orig trgm */
! /*
! * Prevent gcc optimizing the tmpsml variable using volatile
! * keyword. Otherwise comparison of nlimit and tmpsml may give
! * wrong results.
! */
! float4 volatile tmpsml = cnt_sml(qtrg, key, *recheck);
/* strange bug at freebsd 5.2.1 and gcc 3.3.3 */
! res = (*(int *) &tmpsml == *(int *) &nlimit || tmpsml > nlimit);
}
else if (ISALLTRUE(key))
{ /* non-leaf contains signature */
***************
*** 309,316 **** gtrgm_consistent(PG_FUNCTION_ARGS)
if (len == 0)
res = false;
else
! res = (((((float8) count) / ((float8) len))) >= similarity_threshold)
! ? true : false;
}
break;
case ILikeStrategyNumber:
--- 318,324 ----
if (len == 0)
res = false;
else
! res = (((((float8) count) / ((float8) len))) >= nlimit);
}
break;
case ILikeStrategyNumber:
***************
*** 428,433 **** gtrgm_distance(PG_FUNCTION_ARGS)
--- 436,442 ----
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
/* Oid subtype = PG_GETARG_OID(3); */
+ bool *recheck = (bool *) PG_GETARG_POINTER(4);
TRGM *key = (TRGM *) DatumGetPointer(entry->key);
TRGM *qtrg;
float8 res;
***************
*** 463,471 **** gtrgm_distance(PG_FUNCTION_ARGS)
switch (strategy)
{
case DistanceStrategyNumber:
if (GIST_LEAF(entry))
{ /* all leafs contains orig trgm */
! res = 1.0 - cnt_sml(key, qtrg);
}
else if (ISALLTRUE(key))
{ /* all leafs contains orig trgm */
--- 472,488 ----
switch (strategy)
{
case DistanceStrategyNumber:
+ case WordDistanceStrategyNumber:
+ *recheck = strategy == WordDistanceStrategyNumber;
if (GIST_LEAF(entry))
{ /* all leafs contains orig trgm */
! /*
! * Prevent gcc optimizing the sml variable using volatile
! * keyword. Otherwise res can differ from the
! * word_similarity_dist_op() function.
! */
! float4 volatile sml = cnt_sml(qtrg, key, *recheck);
! res = 1.0 - sml;
}
else if (ISALLTRUE(key))
{ /* all leafs contains orig trgm */
*** a/contrib/pg_trgm/trgm_op.c
--- b/contrib/pg_trgm/trgm_op.c
***************
*** 15,21 ****
PG_MODULE_MAGIC;
/* GUC variables */
! double similarity_threshold = 0.3f;
void _PG_init(void);
--- 15,22 ----
PG_MODULE_MAGIC;
/* GUC variables */
! double similarity_threshold = 0.3f;
! double word_similarity_threshold = 0.6f;
void _PG_init(void);
***************
*** 23,30 **** PG_FUNCTION_INFO_V1(set_limit);
--- 24,43 ----
PG_FUNCTION_INFO_V1(show_limit);
PG_FUNCTION_INFO_V1(show_trgm);
PG_FUNCTION_INFO_V1(similarity);
+ PG_FUNCTION_INFO_V1(word_similarity);
PG_FUNCTION_INFO_V1(similarity_dist);
PG_FUNCTION_INFO_V1(similarity_op);
+ PG_FUNCTION_INFO_V1(word_similarity_op);
+ PG_FUNCTION_INFO_V1(word_similarity_commutator_op);
+ PG_FUNCTION_INFO_V1(word_similarity_dist_op);
+ PG_FUNCTION_INFO_V1(word_similarity_dist_commutator_op);
+
+ /* Trigram with position */
+ typedef struct
+ {
+ trgm trg;
+ int index;
+ } pos_trgm;
/*
* Module load callback
***************
*** 45,55 **** _PG_init(void)
NULL,
NULL,
NULL);
}
/*
* Deprecated function.
! * Use "pg_trgm.similarity_threshold" GUC variable instead of this function
*/
Datum
set_limit(PG_FUNCTION_ARGS)
--- 58,80 ----
NULL,
NULL,
NULL);
+ DefineCustomRealVariable("pg_trgm.word_similarity_threshold",
+ "Sets the threshold used by the <%% operator.",
+ "Valid range is 0.0 .. 1.0.",
+ &word_similarity_threshold,
+ 0.6,
+ 0.0,
+ 1.0,
+ PGC_USERSET,
+ 0,
+ NULL,
+ NULL,
+ NULL);
}
/*
* Deprecated function.
! * Use "pg_trgm.similarity_threshold" GUC variable instead of this function.
*/
Datum
set_limit(PG_FUNCTION_ARGS)
***************
*** 59,72 **** set_limit(PG_FUNCTION_ARGS)
if (nlimit < 0 || nlimit > 1.0)
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
! errmsg("wrong limit, should be between 0 and 1")));
similarity_threshold = nlimit;
PG_RETURN_FLOAT4(similarity_threshold);
}
/*
* Deprecated function.
! * Use "pg_trgm.similarity_threshold" GUC variable instead of this function
*/
Datum
show_limit(PG_FUNCTION_ARGS)
--- 84,97 ----
if (nlimit < 0 || nlimit > 1.0)
ereport(ERROR,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
! errmsg("wrong threshold, should be between 0 and 1")));
similarity_threshold = nlimit;
PG_RETURN_FLOAT4(similarity_threshold);
}
/*
* Deprecated function.
! * Use "pg_trgm.similarity_threshold" GUC variable instead of this function.
*/
Datum
show_limit(PG_FUNCTION_ARGS)
***************
*** 199,236 **** make_trigrams(trgm *tptr, char *str, int bytelen, int charlen)
return tptr;
}
! TRGM *
! generate_trgm(char *str, int slen)
{
! TRGM *trg;
char *buf;
! trgm *tptr;
! int len,
! charlen,
bytelen;
char *bword,
*eword;
- /*
- * Guard against possible overflow in the palloc requests below. (We
- * don't worry about the additive constants, since palloc can detect
- * requests that are a little above MaxAllocSize --- we just need to
- * prevent integer overflow in the multiplications.)
- */
- if ((Size) (slen / 2) >= (MaxAllocSize / (sizeof(trgm) * 3)) ||
- (Size) slen >= (MaxAllocSize / pg_database_encoding_max_length()))
- ereport(ERROR,
- (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
- errmsg("out of memory")));
-
- trg = (TRGM *) palloc(TRGMHDRSIZE + sizeof(trgm) * (slen / 2 + 1) *3);
- trg->flag = ARRKEY;
- SET_VARSIZE(trg, TRGMHDRSIZE);
-
if (slen + LPADDING + RPADDING < 3 || slen == 0)
! return trg;
! tptr = GETARR(trg);
/* Allocate a buffer for case-folded, blank-padded words */
buf = (char *) palloc(slen * pg_database_encoding_max_length() + 4);
--- 224,251 ----
return tptr;
}
! /*
! * Make array of trigrams without sorting and removing duplicate items.
! *
! * trg: where to return the array of trigrams.
! * str: source string, of length slen bytes.
! *
! * Returns length of the generated array.
! */
! static int
! generate_trgm_only(trgm *trg, char *str, int slen)
{
! trgm *tptr;
char *buf;
! int charlen,
bytelen;
char *bword,
*eword;
if (slen + LPADDING + RPADDING < 3 || slen == 0)
! return 0;
! tptr = trg;
/* Allocate a buffer for case-folded, blank-padded words */
buf = (char *) palloc(slen * pg_database_encoding_max_length() + 4);
***************
*** 270,276 **** generate_trgm(char *str, int slen)
pfree(buf);
! if ((len = tptr - GETARR(trg)) == 0)
return trg;
/*
--- 285,331 ----
pfree(buf);
! return tptr - trg;
! }
!
! /*
! * Guard against possible overflow in the palloc requests below. (We
! * don't worry about the additive constants, since palloc can detect
! * requests that are a little above MaxAllocSize --- we just need to
! * prevent integer overflow in the multiplications.)
! */
! static void
! protect_out_of_mem(int slen)
! {
! if ((Size) (slen / 2) >= (MaxAllocSize / (sizeof(trgm) * 3)) ||
! (Size) slen >= (MaxAllocSize / pg_database_encoding_max_length()))
! ereport(ERROR,
! (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
! errmsg("out of memory")));
! }
!
! /*
! * Make array of trigrams with sorting and removing duplicate items.
! *
! * str: source string, of length slen bytes.
! *
! * Returns the sorted array of unique trigrams.
! */
! TRGM *
! generate_trgm(char *str, int slen)
! {
! TRGM *trg;
! int len;
!
! protect_out_of_mem(slen);
!
! trg = (TRGM *) palloc(TRGMHDRSIZE + sizeof(trgm) * (slen / 2 + 1) *3);
! trg->flag = ARRKEY;
!
! len = generate_trgm_only(GETARR(trg), str, slen);
! SET_VARSIZE(trg, CALCGTSIZE(ARRKEY, len));
!
! if (len == 0)
return trg;
/*
***************
*** 288,293 **** generate_trgm(char *str, int slen)
--- 343,627 ----
}
/*
+ * Make array of positional trigrams from two trigram arrays trg1 and trg2.
+ *
+ * trg1: trigram array of search pattern, of length len1. trg1 is required
+ * word which positions don't matter and replaced with -1.
+ * trg2: trigram array of text, of length len2. trg2 is haystack where we
+ * search and have to store its positions.
+ *
+ * Returns concatenated trigram array.
+ */
+ static pos_trgm *
+ make_positional_trgm(trgm *trg1, int len1, trgm *trg2, int len2)
+ {
+ pos_trgm *result;
+ int i, len = len1 + len2;
+
+ result = (pos_trgm *) palloc(sizeof(pos_trgm) * len);
+
+ for (i = 0; i < len1; i++)
+ {
+ memcpy(&result[i].trg, &trg1[i], sizeof(trgm));
+ result[i].index = -1;
+ }
+
+ for (i = 0; i < len2; i++)
+ {
+ memcpy(&result[i + len1].trg, &trg2[i], sizeof(trgm));
+ result[i + len1].index = i;
+ }
+
+ return result;
+ }
+
+ /*
+ * Compare position trigrams: compare trigrams first and position second.
+ */
+ static int
+ comp_ptrgm(const void *v1, const void *v2)
+ {
+ const pos_trgm *p1 = (const pos_trgm *)v1;
+ const pos_trgm *p2 = (const pos_trgm *)v2;
+ int cmp;
+
+ cmp = CMPTRGM(p1->trg, p2->trg);
+ if (cmp != 0)
+ return cmp;
+
+ if (p1->index < p2->index)
+ return -1;
+ else if (p1->index == p2->index)
+ return 0;
+ else
+ return 1;
+ }
+
+ /*
+ * Iterative search function which calculates maximum similarity with word in
+ * the string. But maximum similarity is calculated only if check_only == false.
+ *
+ * trg2indexes: array which stores indexes of the array "found".
+ * found: array which stores true of false values.
+ * ulen1: count of unique trigrams of array "trg1".
+ * len2: length of array "trg2" and array "trg2indexes".
+ * len: length of the array "found".
+ * check_only: if true then only check existaince of similar search pattern in
+ * text.
+ *
+ * Returns word similarity.
+ */
+ static float4
+ iterate_word_similarity(int *trg2indexes,
+ bool *found,
+ int ulen1,
+ int len2,
+ int len,
+ bool check_only)
+ {
+ int *lastpos,
+ i,
+ ulen2 = 0,
+ count = 0,
+ upper = -1,
+ lower = -1;
+ float4 smlr_cur,
+ smlr_max = 0.0f;
+
+ /* Memorise last position of each trigram */
+ lastpos = (int *) palloc(sizeof(int) * len);
+ memset(lastpos, -1, sizeof(int) * len);
+
+ for (i = 0; i < len2; i++)
+ {
+ /* Get index of next trigram */
+ int trgindex = trg2indexes[i];
+
+ /* Update last position of this trigram */
+ if (lower >= 0 || found[trgindex])
+ {
+ if (lastpos[trgindex] < 0)
+ {
+ ulen2++;
+ if (found[trgindex])
+ count++;
+ }
+ lastpos[trgindex] = i;
+ }
+
+ /* Adjust lower bound if this trigram is present in required substing */
+ if (found[trgindex])
+ {
+ int prev_lower,
+ tmp_ulen2,
+ tmp_lower,
+ tmp_count;
+
+ upper = i;
+ if (lower == -1)
+ {
+ lower = i;
+ ulen2 = 1;
+ }
+
+ smlr_cur = CALCSML(count, ulen1, ulen2);
+
+ /* Also try to adjust upper bound for greater similarity */
+ tmp_count = count;
+ tmp_ulen2 = ulen2;
+ prev_lower = lower;
+ for (tmp_lower = lower; tmp_lower <= upper; tmp_lower++)
+ {
+ float smlr_tmp = CALCSML(tmp_count, ulen1, tmp_ulen2);
+ int tmp_trgindex;
+
+ if (smlr_tmp > smlr_cur)
+ {
+ smlr_cur = smlr_tmp;
+ ulen2 = tmp_ulen2;
+ lower = tmp_lower;
+ count = tmp_count;
+ }
+ /*
+ * if we only check that word similarity is greater than
+ * pg_trgm.word_similarity_threshold we do not need to calculate
+ * a maximum similarity.
+ */
+ if (check_only && smlr_cur >= word_similarity_threshold)
+ break;
+
+ tmp_trgindex = trg2indexes[tmp_lower];
+ if (lastpos[tmp_trgindex] == tmp_lower)
+ {
+ tmp_ulen2--;
+ if (found[tmp_trgindex])
+ tmp_count--;
+ }
+ }
+
+ smlr_max = Max(smlr_max, smlr_cur);
+ /*
+ * if we only check that word similarity is greater than
+ * pg_trgm.word_similarity_threshold we do not need to calculate a
+ * maximum similarity
+ */
+ if (check_only && smlr_max >= word_similarity_threshold)
+ break;
+
+ for (tmp_lower = prev_lower; tmp_lower < lower; tmp_lower++)
+ {
+ int tmp_trgindex;
+ tmp_trgindex = trg2indexes[tmp_lower];
+ if (lastpos[tmp_trgindex] == tmp_lower)
+ lastpos[tmp_trgindex] = -1;
+ }
+ }
+ }
+
+ pfree(lastpos);
+
+ return smlr_max;
+ }
+
+ /*
+ * Calculate word similarity.
+ * This function prepare two arrays: "trg2indexes" and "found". Then this arrays
+ * are used to calculate word similarity using iterate_word_similarity().
+ *
+ * "trg2indexes" is array which stores indexes of the array "found".
+ * In other words:
+ * trg2indexes[j] = i;
+ * found[i] = true (or false);
+ * If found[i] == true then there is trigram trg2[j] in array "trg1".
+ * If found[i] == false then there is not trigram trg2[j] in array "trg1".
+ *
+ * str1: search pattern string, of length slen1 bytes.
+ * str2: text in which we are looking for a word, of length slen2 bytes.
+ * check_only: if true then only check existaince of similar search pattern in
+ * text.
+ *
+ * Returns word similarity.
+ */
+ static float4
+ calc_word_similarity(char *str1, int slen1, char *str2, int slen2,
+ bool check_only)
+ {
+ bool *found;
+ pos_trgm *ptrg;
+ trgm *trg1;
+ trgm *trg2;
+ int len1,
+ len2,
+ len,
+ i,
+ j,
+ ulen1;
+ int *trg2indexes;
+ float4 result;
+
+ protect_out_of_mem(slen1 + slen2);
+
+ /* Make positional trigrams */
+ trg1 = (trgm *) palloc(sizeof(trgm) * (slen1 / 2 + 1) * 3);
+ trg2 = (trgm *) palloc(sizeof(trgm) * (slen2 / 2 + 1) * 3);
+
+ len1 = generate_trgm_only(trg1, str1, slen1);
+ len2 = generate_trgm_only(trg2, str2, slen2);
+
+ ptrg = make_positional_trgm(trg1, len1, trg2, len2);
+ len = len1 + len2;
+ qsort(ptrg, len, sizeof(pos_trgm), comp_ptrgm);
+
+ pfree(trg1);
+ pfree(trg2);
+
+ /*
+ * Merge positional trigrams array: enumerate each trigram and find its
+ * presence in required word.
+ */
+ trg2indexes = (int *) palloc(sizeof(int) * len2);
+ found = (bool *) palloc0(sizeof(bool) * len);
+
+ ulen1 = 0;
+ j = 0;
+ for (i = 0; i < len; i++)
+ {
+ if (i > 0)
+ {
+ int cmp = CMPTRGM(ptrg[i - 1].trg, ptrg[i].trg);
+ if (cmp != 0)
+ {
+ if (found[j])
+ ulen1++;
+ j++;
+ }
+ }
+
+ if (ptrg[i].index >= 0)
+ {
+ trg2indexes[ptrg[i].index] = j;
+ }
+ else
+ {
+ found[j] = true;
+ }
+ }
+ if (found[j])
+ ulen1++;
+
+ /* Run iterative procedure to find maximum similarity with word */
+ result = iterate_word_similarity(trg2indexes, found, ulen1, len2, len,
+ check_only);
+
+ pfree(trg2indexes);
+ pfree(found);
+ pfree(ptrg);
+
+ return result;
+ }
+
+
+ /*
* Extract the next non-wildcard part of a search string, ie, a word bounded
* by '_' or '%' meta-characters, non-word characters or string end.
*
***************
*** 459,475 **** generate_wildcard_trgm(const char *str, int slen)
bytelen;
const char *eword;
! /*
! * Guard against possible overflow in the palloc requests below. (We
! * don't worry about the additive constants, since palloc can detect
! * requests that are a little above MaxAllocSize --- we just need to
! * prevent integer overflow in the multiplications.)
! */
! if ((Size) (slen / 2) >= (MaxAllocSize / (sizeof(trgm) * 3)) ||
! (Size) slen >= (MaxAllocSize / pg_database_encoding_max_length()))
! ereport(ERROR,
! (errcode(ERRCODE_PROGRAM_LIMIT_EXCEEDED),
! errmsg("out of memory")));
trg = (TRGM *) palloc(TRGMHDRSIZE + sizeof(trgm) * (slen / 2 + 1) *3);
trg->flag = ARRKEY;
--- 793,799 ----
bytelen;
const char *eword;
! protect_out_of_mem(slen);
trg = (TRGM *) palloc(TRGMHDRSIZE + sizeof(trgm) * (slen / 2 + 1) *3);
trg->flag = ARRKEY;
***************
*** 590,596 **** show_trgm(PG_FUNCTION_ARGS)
}
float4
! cnt_sml(TRGM *trg1, TRGM *trg2)
{
trgm *ptr1,
*ptr2;
--- 914,920 ----
}
float4
! cnt_sml(TRGM *trg1, TRGM *trg2, bool inexact)
{
trgm *ptr1,
*ptr2;
***************
*** 624,637 **** cnt_sml(TRGM *trg1, TRGM *trg2)
}
}
! #ifdef DIVUNION
! return ((float4) count) / ((float4) (len1 + len2 - count));
! #else
! return ((float4) count) / ((float4) ((len1 > len2) ? len1 : len2));
! #endif
!
}
/*
* Returns whether trg2 contains all trigrams in trg1.
* This relies on the trigram arrays being sorted.
--- 948,962 ----
}
}
! /*
! * If inexact then len2 is equal to count, because we don't know actual
! * length of second string in inexact search and we can assume that count
! * is a lower bound of len2.
! */
! return CALCSML(count, len1, inexact ? count : len2);
}
+
/*
* Returns whether trg2 contains all trigrams in trg1.
* This relies on the trigram arrays being sorted.
***************
*** 726,732 **** similarity(PG_FUNCTION_ARGS)
trg1 = generate_trgm(VARDATA(in1), VARSIZE(in1) - VARHDRSZ);
trg2 = generate_trgm(VARDATA(in2), VARSIZE(in2) - VARHDRSZ);
! res = cnt_sml(trg1, trg2);
pfree(trg1);
pfree(trg2);
--- 1051,1057 ----
trg1 = generate_trgm(VARDATA(in1), VARSIZE(in1) - VARHDRSZ);
trg2 = generate_trgm(VARDATA(in2), VARSIZE(in2) - VARHDRSZ);
! res = cnt_sml(trg1, trg2, false);
pfree(trg1);
pfree(trg2);
***************
*** 737,742 **** similarity(PG_FUNCTION_ARGS)
--- 1062,1083 ----
}
Datum
+ word_similarity(PG_FUNCTION_ARGS)
+ {
+ text *in1 = PG_GETARG_TEXT_PP(0);
+ text *in2 = PG_GETARG_TEXT_PP(1);
+ float4 res;
+
+ res = calc_word_similarity(VARDATA_ANY(in1), VARSIZE_ANY_EXHDR(in1),
+ VARDATA_ANY(in2), VARSIZE_ANY_EXHDR(in2),
+ false);
+
+ PG_FREE_IF_COPY(in1, 0);
+ PG_FREE_IF_COPY(in2, 1);
+ PG_RETURN_FLOAT4(res);
+ }
+
+ Datum
similarity_dist(PG_FUNCTION_ARGS)
{
float4 res = DatumGetFloat4(DirectFunctionCall2(similarity,
***************
*** 755,757 **** similarity_op(PG_FUNCTION_ARGS)
--- 1096,1162 ----
PG_RETURN_BOOL(res >= similarity_threshold);
}
+
+ Datum
+ word_similarity_op(PG_FUNCTION_ARGS)
+ {
+ text *in1 = PG_GETARG_TEXT_PP(0);
+ text *in2 = PG_GETARG_TEXT_PP(1);
+ float4 res;
+
+ res = calc_word_similarity(VARDATA_ANY(in1), VARSIZE_ANY_EXHDR(in1),
+ VARDATA_ANY(in2), VARSIZE_ANY_EXHDR(in2),
+ true);
+
+ PG_FREE_IF_COPY(in1, 0);
+ PG_FREE_IF_COPY(in2, 1);
+ PG_RETURN_BOOL(res >= word_similarity_threshold);
+ }
+
+ Datum
+ word_similarity_commutator_op(PG_FUNCTION_ARGS)
+ {
+ text *in1 = PG_GETARG_TEXT_PP(0);
+ text *in2 = PG_GETARG_TEXT_PP(1);
+ float4 res;
+
+ res = calc_word_similarity(VARDATA_ANY(in2), VARSIZE_ANY_EXHDR(in2),
+ VARDATA_ANY(in1), VARSIZE_ANY_EXHDR(in1),
+ true);
+
+ PG_FREE_IF_COPY(in1, 0);
+ PG_FREE_IF_COPY(in2, 1);
+ PG_RETURN_BOOL(res >= word_similarity_threshold);
+ }
+
+ Datum
+ word_similarity_dist_op(PG_FUNCTION_ARGS)
+ {
+ text *in1 = PG_GETARG_TEXT_PP(0);
+ text *in2 = PG_GETARG_TEXT_PP(1);
+ float4 res;
+
+ res = calc_word_similarity(VARDATA_ANY(in1), VARSIZE_ANY_EXHDR(in1),
+ VARDATA_ANY(in2), VARSIZE_ANY_EXHDR(in2),
+ false);
+
+ PG_FREE_IF_COPY(in1, 0);
+ PG_FREE_IF_COPY(in2, 1);
+ PG_RETURN_FLOAT4(1.0 - res);
+ }
+
+ Datum
+ word_similarity_dist_commutator_op(PG_FUNCTION_ARGS)
+ {
+ text *in1 = PG_GETARG_TEXT_PP(0);
+ text *in2 = PG_GETARG_TEXT_PP(1);
+ float4 res;
+
+ res = calc_word_similarity(VARDATA_ANY(in2), VARSIZE_ANY_EXHDR(in2),
+ VARDATA_ANY(in1), VARSIZE_ANY_EXHDR(in1),
+ false);
+
+ PG_FREE_IF_COPY(in1, 0);
+ PG_FREE_IF_COPY(in2, 1);
+ PG_RETURN_FLOAT4(1.0 - res);
+ }
*** a/doc/src/sgml/pgtrgm.sgml
--- b/doc/src/sgml/pgtrgm.sgml
***************
*** 85,90 ****
--- 85,104 ----
</entry>
</row>
<row>
+ <entry>
+ <function>word_similarity(text, text)</function>
+ <indexterm><primary>word_similarity</primary></indexterm>
+ </entry>
+ <entry><type>real</type></entry>
+ <entry>
+ Returns a number that indicates how similar the first string
+ to the most similar word of the second string. The range of
+ the result is zero (indicating that the two strings are completely
+ dissimilar) to one (indicating that the first string is identical
+ to one of the word of the second string).
+ </entry>
+ </row>
+ <row>
<entry><function>show_trgm(text)</function><indexterm><primary>show_trgm</primary></indexterm></entry>
<entry><type>text[]</type></entry>
<entry>
***************
*** 138,143 ****
--- 152,167 ----
</entry>
</row>
<row>
+ <entry><type>text</> <literal>%></literal> <type>text</></entry>
+ <entry><type>boolean</type></entry>
+ <entry>
+ Returns <literal>true</> if its first argument have a word which is the
+ similar word to the second argument and they have a similarity
+ that is greater than the current word similarity threshold set by
+ <varname>pg_trgm.word_similarity_threshold</> parameter.
+ </entry>
+ </row>
+ <row>
<entry><type>text</> <literal><-></literal> <type>text</></entry>
<entry><type>real</type></entry>
<entry>
***************
*** 145,150 ****
--- 169,184 ----
one minus the <function>similarity()</> value.
</entry>
</row>
+ <row>
+ <entry>
+ <type>text</> <literal><->></literal> <type>text</>
+ </entry>
+ <entry><type>real</type></entry>
+ <entry>
+ Returns the <quote>distance</> between the arguments, that is
+ one minus the <function>word_similarity()</> value.
+ </entry>
+ </row>
</tbody>
</tgroup>
</table>
***************
*** 158,164 ****
<term>
<varname>pg_trgm.similarity_threshold</> (<type>real</type>)
<indexterm>
! <primary><varname>pg_trgm.similarity_threshold</> configuration parameter</primary>
</indexterm>
</term>
<listitem>
--- 192,200 ----
<term>
<varname>pg_trgm.similarity_threshold</> (<type>real</type>)
<indexterm>
! <primary>
! <varname>pg_trgm.similarity_threshold</> configuration parameter
! </primary>
</indexterm>
</term>
<listitem>
***************
*** 168,173 ****
--- 204,227 ----
</para>
</listitem>
</varlistentry>
+
+ <varlistentry id="guc-pgtrgm-word-similarity-threshold" xreflabel="pg_trgm.word_similarity_threshold">
+ <term>
+ <varname>pg_trgm.word_similarity_threshold</> (<type>real</type>)
+ <indexterm>
+ <primary>
+ <varname>pg_trgm.word_similarity_threshold</> configuration parameter
+ </primary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ Sets the current word similarity threshold that is used by
+ the <literal>%></> operator. The threshold must be between
+ 0 and 1 (default is 0.6).
+ </para>
+ </listitem>
+ </varlistentry>
</variablelist>
</sect2>
***************
*** 226,231 **** SELECT t, t <-> '<replaceable>word</>' AS dist
--- 280,311 ----
</para>
<para>
+ Also you can use an index on the <structfield>t</> column for word
+ similarity. For example:
+ <programlisting>
+ SELECT t, word_similarity('<replaceable>word</>', t) AS sml
+ FROM test_trgm
+ WHERE t %> '<replaceable>word</>'
+ ORDER BY sml DESC, t;
+ </programlisting>
+ This will return all values in the text column that have a word
+ which sufficiently similar to <replaceable>word</>, sorted from best
+ match to worst. The index will be used to make this a fast operation
+ even over very large data sets.
+ </para>
+
+ <para>
+ A variant of the above query is
+ <programlisting>
+ SELECT t, t <->> '<replaceable>word</>' AS dist
+ FROM test_trgm
+ ORDER BY dist LIMIT 10;
+ </programlisting>
+ This can be implemented quite efficiently by GiST indexes, but not
+ by GIN indexes.
+ </para>
+
+ <para>
Beginning in <productname>PostgreSQL</> 9.1, these index types also support
index searches for <literal>LIKE</> and <literal>ILIKE</>, for example
<programlisting>
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