Add GIN support for pg_trgm. From Guillaume Smet <guillaume.smet@gmail.com>

with minor editorization by me.

contrib/pg_trgm/Makefile

-# $PostgreSQL: pgsql/contrib/pg_trgm/Makefile,v 1.6 2007/02/09 17:24:33 petere Exp $
+# $PostgreSQL: pgsql/contrib/pg_trgm/Makefile,v 1.7 2007/03/14 14:15:40 teodor Exp $
 
 MODULE_big = pg_trgm
-OBJS = trgm_op.o trgm_gist.o 
+OBJS = trgm_op.o trgm_gist.o trgm_gin.o
 
 DATA_built = pg_trgm.sql
 DATA = uninstall_pg_trgm.sql

contrib/pg_trgm/README.pg_trgm

@@ -113,6 +113,8 @@ Tsearch2 Integration
 	Next, create a trigram index on the word column:
 
 	CREATE INDEX words_idx ON words USING gist(word gist_trgm_ops);
+	or
+	CREATE INDEX words_idx ON words USING gin(word gist_trgm_ops);
 
 	Now, a SELECT query similar to the example above can be used to
 	suggest spellings for misspelled words in user search terms. A

contrib/pg_trgm/expected/pg_trgm.out

@@ -2312,3 +2312,1132 @@ select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu198
  qwertyu0988 | 0.333333
 (1 row)
 
+drop index trgm_idx;
+create index trgm_idx on test_trgm using gin (t gin_trgm_ops);
+set enable_seqscan=off;
+select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
+      t      |   sml    
+-------------+----------
+ qwertyu0988 |        1
+ qwertyu0980 | 0.714286
+ qwertyu0981 | 0.714286
+ qwertyu0982 | 0.714286
+ qwertyu0983 | 0.714286
+ qwertyu0984 | 0.714286
+ qwertyu0985 | 0.714286
+ qwertyu0986 | 0.714286
+ qwertyu0987 | 0.714286
+ qwertyu0989 | 0.714286
+ qwertyu0088 |      0.6
+ qwertyu0098 |      0.6
+ qwertyu0188 |      0.6
+ qwertyu0288 |      0.6
+ qwertyu0388 |      0.6
+ qwertyu0488 |      0.6
+ qwertyu0588 |      0.6
+ qwertyu0688 |      0.6
+ qwertyu0788 |      0.6
+ qwertyu0888 |      0.6
+ qwertyu0900 |      0.6
+ qwertyu0901 |      0.6
+ qwertyu0902 |      0.6
+ qwertyu0903 |      0.6
+ qwertyu0904 |      0.6
+ qwertyu0905 |      0.6
+ qwertyu0906 |      0.6
+ qwertyu0907 |      0.6
+ qwertyu0908 |      0.6
+ qwertyu0909 |      0.6
+ qwertyu0910 |      0.6
+ qwertyu0911 |      0.6
+ qwertyu0912 |      0.6
+ qwertyu0913 |      0.6
+ qwertyu0914 |      0.6
+ qwertyu0915 |      0.6
+ qwertyu0916 |      0.6
+ qwertyu0917 |      0.6
+ qwertyu0918 |      0.6
+ qwertyu0919 |      0.6
+ qwertyu0920 |      0.6
+ qwertyu0921 |      0.6
+ qwertyu0922 |      0.6
+ qwertyu0923 |      0.6
+ qwertyu0924 |      0.6
+ qwertyu0925 |      0.6
+ qwertyu0926 |      0.6
+ qwertyu0927 |      0.6
+ qwertyu0928 |      0.6
+ qwertyu0929 |      0.6
+ qwertyu0930 |      0.6
+ qwertyu0931 |      0.6
+ qwertyu0932 |      0.6
+ qwertyu0933 |      0.6
+ qwertyu0934 |      0.6
+ qwertyu0935 |      0.6
+ qwertyu0936 |      0.6
+ qwertyu0937 |      0.6
+ qwertyu0938 |      0.6
+ qwertyu0939 |      0.6
+ qwertyu0940 |      0.6
+ qwertyu0941 |      0.6
+ qwertyu0942 |      0.6
+ qwertyu0943 |      0.6
+ qwertyu0944 |      0.6
+ qwertyu0945 |      0.6
+ qwertyu0946 |      0.6
+ qwertyu0947 |      0.6
+ qwertyu0948 |      0.6
+ qwertyu0949 |      0.6
+ qwertyu0950 |      0.6
+ qwertyu0951 |      0.6
+ qwertyu0952 |      0.6
+ qwertyu0953 |      0.6
+ qwertyu0954 |      0.6
+ qwertyu0955 |      0.6
+ qwertyu0956 |      0.6
+ qwertyu0957 |      0.6
+ qwertyu0958 |      0.6
+ qwertyu0959 |      0.6
+ qwertyu0960 |      0.6
+ qwertyu0961 |      0.6
+ qwertyu0962 |      0.6
+ qwertyu0963 |      0.6
+ qwertyu0964 |      0.6
+ qwertyu0965 |      0.6
+ qwertyu0966 |      0.6
+ qwertyu0967 |      0.6
+ qwertyu0968 |      0.6
+ qwertyu0969 |      0.6
+ qwertyu0970 |      0.6
+ qwertyu0971 |      0.6
+ qwertyu0972 |      0.6
+ qwertyu0973 |      0.6
+ qwertyu0974 |      0.6
+ qwertyu0975 |      0.6
+ qwertyu0976 |      0.6
+ qwertyu0977 |      0.6
+ qwertyu0978 |      0.6
+ qwertyu0979 |      0.6
+ qwertyu0990 |      0.6
+ qwertyu0991 |      0.6
+ qwertyu0992 |      0.6
+ qwertyu0993 |      0.6
+ qwertyu0994 |      0.6
+ qwertyu0995 |      0.6
+ qwertyu0996 |      0.6
+ qwertyu0997 |      0.6
+ qwertyu0998 |      0.6
+ qwertyu0999 |      0.6
+ qwertyu0001 |      0.5
+ qwertyu0002 |      0.5
+ qwertyu0003 |      0.5
+ qwertyu0004 |      0.5
+ qwertyu0005 |      0.5
+ qwertyu0006 |      0.5
+ qwertyu0007 |      0.5
+ qwertyu0008 |      0.5
+ qwertyu0009 |      0.5
+ qwertyu0010 |      0.5
+ qwertyu0011 |      0.5
+ qwertyu0012 |      0.5
+ qwertyu0013 |      0.5
+ qwertyu0014 |      0.5
+ qwertyu0015 |      0.5
+ qwertyu0016 |      0.5
+ qwertyu0017 |      0.5
+ qwertyu0018 |      0.5
+ qwertyu0019 |      0.5
+ qwertyu0020 |      0.5
+ qwertyu0021 |      0.5
+ qwertyu0022 |      0.5
+ qwertyu0023 |      0.5
+ qwertyu0024 |      0.5
+ qwertyu0025 |      0.5
+ qwertyu0026 |      0.5
+ qwertyu0027 |      0.5
+ qwertyu0028 |      0.5
+ qwertyu0029 |      0.5
+ qwertyu0030 |      0.5
+ qwertyu0031 |      0.5
+ qwertyu0032 |      0.5
+ qwertyu0033 |      0.5
+ qwertyu0034 |      0.5
+ qwertyu0035 |      0.5
+ qwertyu0036 |      0.5
+ qwertyu0037 |      0.5
+ qwertyu0038 |      0.5
+ qwertyu0039 |      0.5
+ qwertyu0040 |      0.5
+ qwertyu0041 |      0.5
+ qwertyu0042 |      0.5
+ qwertyu0043 |      0.5
+ qwertyu0044 |      0.5
+ qwertyu0045 |      0.5
+ qwertyu0046 |      0.5
+ qwertyu0047 |      0.5
+ qwertyu0048 |      0.5
+ qwertyu0049 |      0.5
+ qwertyu0050 |      0.5
+ qwertyu0051 |      0.5
+ qwertyu0052 |      0.5
+ qwertyu0053 |      0.5
+ qwertyu0054 |      0.5
+ qwertyu0055 |      0.5
+ qwertyu0056 |      0.5
+ qwertyu0057 |      0.5
+ qwertyu0058 |      0.5
+ qwertyu0059 |      0.5
+ qwertyu0060 |      0.5
+ qwertyu0061 |      0.5
+ qwertyu0062 |      0.5
+ qwertyu0063 |      0.5
+ qwertyu0064 |      0.5
+ qwertyu0065 |      0.5
+ qwertyu0066 |      0.5
+ qwertyu0067 |      0.5
+ qwertyu0068 |      0.5
+ qwertyu0069 |      0.5
+ qwertyu0070 |      0.5
+ qwertyu0071 |      0.5
+ qwertyu0072 |      0.5
+ qwertyu0073 |      0.5
+ qwertyu0074 |      0.5
+ qwertyu0075 |      0.5
+ qwertyu0076 |      0.5
+ qwertyu0077 |      0.5
+ qwertyu0078 |      0.5
+ qwertyu0079 |      0.5
+ qwertyu0080 |      0.5
+ qwertyu0081 |      0.5
+ qwertyu0082 |      0.5
+ qwertyu0083 |      0.5
+ qwertyu0084 |      0.5
+ qwertyu0085 |      0.5
+ qwertyu0086 |      0.5
+ qwertyu0087 |      0.5
+ qwertyu0089 |      0.5
+ qwertyu0090 |      0.5
+ qwertyu0091 |      0.5
+ qwertyu0092 |      0.5
+ qwertyu0093 |      0.5
+ qwertyu0094 |      0.5
+ qwertyu0095 |      0.5
+ qwertyu0096 |      0.5
+ qwertyu0097 |      0.5
+ qwertyu0099 |      0.5
+ qwertyu0100 |      0.5
+ qwertyu0101 |      0.5
+ qwertyu0102 |      0.5
+ qwertyu0103 |      0.5
+ qwertyu0104 |      0.5
+ qwertyu0105 |      0.5
+ qwertyu0106 |      0.5
+ qwertyu0107 |      0.5
+ qwertyu0108 |      0.5
+ qwertyu0109 |      0.5
+ qwertyu0110 |      0.5
+ qwertyu0111 |      0.5
+ qwertyu0112 |      0.5
+ qwertyu0113 |      0.5
+ qwertyu0114 |      0.5
+ qwertyu0115 |      0.5
+ qwertyu0116 |      0.5
+ qwertyu0117 |      0.5
+ qwertyu0118 |      0.5
+ qwertyu0119 |      0.5
+ qwertyu0120 |      0.5
+ qwertyu0121 |      0.5
+ qwertyu0122 |      0.5
+ qwertyu0123 |      0.5
+ qwertyu0124 |      0.5
+ qwertyu0125 |      0.5
+ qwertyu0126 |      0.5
+ qwertyu0127 |      0.5
+ qwertyu0128 |      0.5
+ qwertyu0129 |      0.5
+ qwertyu0130 |      0.5
+ qwertyu0131 |      0.5
+ qwertyu0132 |      0.5
+ qwertyu0133 |      0.5
+ qwertyu0134 |      0.5
+ qwertyu0135 |      0.5
+ qwertyu0136 |      0.5
+ qwertyu0137 |      0.5
+ qwertyu0138 |      0.5
+ qwertyu0139 |      0.5
+ qwertyu0140 |      0.5
+ qwertyu0141 |      0.5
+ qwertyu0142 |      0.5
+ qwertyu0143 |      0.5
+ qwertyu0144 |      0.5
+ qwertyu0145 |      0.5
+ qwertyu0146 |      0.5
+ qwertyu0147 |      0.5
+ qwertyu0148 |      0.5
+ qwertyu0149 |      0.5
+ qwertyu0150 |      0.5
+ qwertyu0151 |      0.5
+ qwertyu0152 |      0.5
+ qwertyu0153 |      0.5
+ qwertyu0154 |      0.5
+ qwertyu0155 |      0.5
+ qwertyu0156 |      0.5
+ qwertyu0157 |      0.5
+ qwertyu0158 |      0.5
+ qwertyu0159 |      0.5
+ qwertyu0160 |      0.5
+ qwertyu0161 |      0.5
+ qwertyu0162 |      0.5
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+ qwertyu0164 |      0.5
+ qwertyu0165 |      0.5
+ qwertyu0166 |      0.5
+ qwertyu0167 |      0.5
+ qwertyu0168 |      0.5
+ qwertyu0169 |      0.5
+ qwertyu0170 |      0.5
+ qwertyu0171 |      0.5
+ qwertyu0172 |      0.5
+ qwertyu0173 |      0.5
+ qwertyu0174 |      0.5
+ qwertyu0175 |      0.5
+ qwertyu0176 |      0.5
+ qwertyu0177 |      0.5
+ qwertyu0178 |      0.5
+ qwertyu0179 |      0.5
+ qwertyu0180 |      0.5
+ qwertyu0181 |      0.5
+ qwertyu0182 |      0.5
+ qwertyu0183 |      0.5
+ qwertyu0184 |      0.5
+ qwertyu0185 |      0.5
+ qwertyu0186 |      0.5
+ qwertyu0187 |      0.5
+ qwertyu0189 |      0.5
+ qwertyu0190 |      0.5
+ qwertyu0191 |      0.5
+ qwertyu0192 |      0.5
+ qwertyu0193 |      0.5
+ qwertyu0194 |      0.5
+ qwertyu0195 |      0.5
+ qwertyu0196 |      0.5
+ qwertyu0197 |      0.5
+ qwertyu0198 |      0.5
+ qwertyu0199 |      0.5
+ qwertyu0200 |      0.5
+ qwertyu0201 |      0.5
+ qwertyu0202 |      0.5
+ qwertyu0203 |      0.5
+ qwertyu0204 |      0.5
+ qwertyu0205 |      0.5
+ qwertyu0206 |      0.5
+ qwertyu0207 |      0.5
+ qwertyu0208 |      0.5
+ qwertyu0209 |      0.5
+ qwertyu0210 |      0.5
+ qwertyu0211 |      0.5
+ qwertyu0212 |      0.5
+ qwertyu0213 |      0.5
+ qwertyu0214 |      0.5
+ qwertyu0215 |      0.5
+ qwertyu0216 |      0.5
+ qwertyu0217 |      0.5
+ qwertyu0218 |      0.5
+ qwertyu0219 |      0.5
+ qwertyu0220 |      0.5
+ qwertyu0221 |      0.5
+ qwertyu0222 |      0.5
+ qwertyu0223 |      0.5
+ qwertyu0224 |      0.5
+ qwertyu0225 |      0.5
+ qwertyu0226 |      0.5
+ qwertyu0227 |      0.5
+ qwertyu0228 |      0.5
+ qwertyu0229 |      0.5
+ qwertyu0230 |      0.5
+ qwertyu0231 |      0.5
+ qwertyu0232 |      0.5
+ qwertyu0233 |      0.5
+ qwertyu0234 |      0.5
+ qwertyu0235 |      0.5
+ qwertyu0236 |      0.5
+ qwertyu0237 |      0.5
+ qwertyu0238 |      0.5
+ qwertyu0239 |      0.5
+ qwertyu0240 |      0.5
+ qwertyu0241 |      0.5
+ qwertyu0242 |      0.5
+ qwertyu0243 |      0.5
+ qwertyu0244 |      0.5
+ qwertyu0245 |      0.5
+ qwertyu0246 |      0.5
+ qwertyu0247 |      0.5
+ qwertyu0248 |      0.5
+ qwertyu0249 |      0.5
+ qwertyu0250 |      0.5
+ qwertyu0251 |      0.5
+ qwertyu0252 |      0.5
+ qwertyu0253 |      0.5
+ qwertyu0254 |      0.5
+ qwertyu0255 |      0.5
+ qwertyu0256 |      0.5
+ qwertyu0257 |      0.5
+ qwertyu0258 |      0.5
+ qwertyu0259 |      0.5
+ qwertyu0260 |      0.5
+ qwertyu0261 |      0.5
+ qwertyu0262 |      0.5
+ qwertyu0263 |      0.5
+ qwertyu0264 |      0.5
+ qwertyu0265 |      0.5
+ qwertyu0266 |      0.5
+ qwertyu0267 |      0.5
+ qwertyu0268 |      0.5
+ qwertyu0269 |      0.5
+ qwertyu0270 |      0.5
+ qwertyu0271 |      0.5
+ qwertyu0272 |      0.5
+ qwertyu0273 |      0.5
+ qwertyu0274 |      0.5
+ qwertyu0275 |      0.5
+ qwertyu0276 |      0.5
+ qwertyu0277 |      0.5
+ qwertyu0278 |      0.5
+ qwertyu0279 |      0.5
+ qwertyu0280 |      0.5
+ qwertyu0281 |      0.5
+ qwertyu0282 |      0.5
+ qwertyu0283 |      0.5
+ qwertyu0284 |      0.5
+ qwertyu0285 |      0.5
+ qwertyu0286 |      0.5
+ qwertyu0287 |      0.5
+ qwertyu0289 |      0.5
+ qwertyu0290 |      0.5
+ qwertyu0291 |      0.5
+ qwertyu0292 |      0.5
+ qwertyu0293 |      0.5
+ qwertyu0294 |      0.5
+ qwertyu0295 |      0.5
+ qwertyu0296 |      0.5
+ qwertyu0297 |      0.5
+ qwertyu0298 |      0.5
+ qwertyu0299 |      0.5
+ qwertyu0300 |      0.5
+ qwertyu0301 |      0.5
+ qwertyu0302 |      0.5
+ qwertyu0303 |      0.5
+ qwertyu0304 |      0.5
+ qwertyu0305 |      0.5
+ qwertyu0306 |      0.5
+ qwertyu0307 |      0.5
+ qwertyu0308 |      0.5
+ qwertyu0309 |      0.5
+ qwertyu0310 |      0.5
+ qwertyu0311 |      0.5
+ qwertyu0312 |      0.5
+ qwertyu0313 |      0.5
+ qwertyu0314 |      0.5
+ qwertyu0315 |      0.5
+ qwertyu0316 |      0.5
+ qwertyu0317 |      0.5
+ qwertyu0318 |      0.5
+ qwertyu0319 |      0.5
+ qwertyu0320 |      0.5
+ qwertyu0321 |      0.5
+ qwertyu0322 |      0.5
+ qwertyu0323 |      0.5
+ qwertyu0324 |      0.5
+ qwertyu0325 |      0.5
+ qwertyu0326 |      0.5
+ qwertyu0327 |      0.5
+ qwertyu0328 |      0.5
+ qwertyu0329 |      0.5
+ qwertyu0330 |      0.5
+ qwertyu0331 |      0.5
+ qwertyu0332 |      0.5
+ qwertyu0333 |      0.5
+ qwertyu0334 |      0.5
+ qwertyu0335 |      0.5
+ qwertyu0336 |      0.5
+ qwertyu0337 |      0.5
+ qwertyu0338 |      0.5
+ qwertyu0339 |      0.5
+ qwertyu0340 |      0.5
+ qwertyu0341 |      0.5
+ qwertyu0342 |      0.5
+ qwertyu0343 |      0.5
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+ qwertyu0345 |      0.5
+ qwertyu0346 |      0.5
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+ qwertyu0885 |      0.5
+ qwertyu0886 |      0.5
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+ qwertyu0897 |      0.5
+ qwertyu0898 |      0.5
+ qwertyu0899 |      0.5
+ qwertyu1000 | 0.411765
+(1000 rows)
+
+select t,similarity(t,'gwertyu0988') as sml from test_trgm where t % 'gwertyu0988' order by sml desc, t;
+      t      |   sml    
+-------------+----------
+ qwertyu0988 |      0.6
+ qwertyu0980 | 0.411765
+ qwertyu0981 | 0.411765
+ qwertyu0982 | 0.411765
+ qwertyu0983 | 0.411765
+ qwertyu0984 | 0.411765
+ qwertyu0985 | 0.411765
+ qwertyu0986 | 0.411765
+ qwertyu0987 | 0.411765
+ qwertyu0989 | 0.411765
+ qwertyu0088 | 0.333333
+ qwertyu0098 | 0.333333
+ qwertyu0188 | 0.333333
+ qwertyu0288 | 0.333333
+ qwertyu0388 | 0.333333
+ qwertyu0488 | 0.333333
+ qwertyu0588 | 0.333333
+ qwertyu0688 | 0.333333
+ qwertyu0788 | 0.333333
+ qwertyu0888 | 0.333333
+ qwertyu0900 | 0.333333
+ qwertyu0901 | 0.333333
+ qwertyu0902 | 0.333333
+ qwertyu0903 | 0.333333
+ qwertyu0904 | 0.333333
+ qwertyu0905 | 0.333333
+ qwertyu0906 | 0.333333
+ qwertyu0907 | 0.333333
+ qwertyu0908 | 0.333333
+ qwertyu0909 | 0.333333
+ qwertyu0910 | 0.333333
+ qwertyu0911 | 0.333333
+ qwertyu0912 | 0.333333
+ qwertyu0913 | 0.333333
+ qwertyu0914 | 0.333333
+ qwertyu0915 | 0.333333
+ qwertyu0916 | 0.333333
+ qwertyu0917 | 0.333333
+ qwertyu0918 | 0.333333
+ qwertyu0919 | 0.333333
+ qwertyu0920 | 0.333333
+ qwertyu0921 | 0.333333
+ qwertyu0922 | 0.333333
+ qwertyu0923 | 0.333333
+ qwertyu0924 | 0.333333
+ qwertyu0925 | 0.333333
+ qwertyu0926 | 0.333333
+ qwertyu0927 | 0.333333
+ qwertyu0928 | 0.333333
+ qwertyu0929 | 0.333333
+ qwertyu0930 | 0.333333
+ qwertyu0931 | 0.333333
+ qwertyu0932 | 0.333333
+ qwertyu0933 | 0.333333
+ qwertyu0934 | 0.333333
+ qwertyu0935 | 0.333333
+ qwertyu0936 | 0.333333
+ qwertyu0937 | 0.333333
+ qwertyu0938 | 0.333333
+ qwertyu0939 | 0.333333
+ qwertyu0940 | 0.333333
+ qwertyu0941 | 0.333333
+ qwertyu0942 | 0.333333
+ qwertyu0943 | 0.333333
+ qwertyu0944 | 0.333333
+ qwertyu0945 | 0.333333
+ qwertyu0946 | 0.333333
+ qwertyu0947 | 0.333333
+ qwertyu0948 | 0.333333
+ qwertyu0949 | 0.333333
+ qwertyu0950 | 0.333333
+ qwertyu0951 | 0.333333
+ qwertyu0952 | 0.333333
+ qwertyu0953 | 0.333333
+ qwertyu0954 | 0.333333
+ qwertyu0955 | 0.333333
+ qwertyu0956 | 0.333333
+ qwertyu0957 | 0.333333
+ qwertyu0958 | 0.333333
+ qwertyu0959 | 0.333333
+ qwertyu0960 | 0.333333
+ qwertyu0961 | 0.333333
+ qwertyu0962 | 0.333333
+ qwertyu0963 | 0.333333
+ qwertyu0964 | 0.333333
+ qwertyu0965 | 0.333333
+ qwertyu0966 | 0.333333
+ qwertyu0967 | 0.333333
+ qwertyu0968 | 0.333333
+ qwertyu0969 | 0.333333
+ qwertyu0970 | 0.333333
+ qwertyu0971 | 0.333333
+ qwertyu0972 | 0.333333
+ qwertyu0973 | 0.333333
+ qwertyu0974 | 0.333333
+ qwertyu0975 | 0.333333
+ qwertyu0976 | 0.333333
+ qwertyu0977 | 0.333333
+ qwertyu0978 | 0.333333
+ qwertyu0979 | 0.333333
+ qwertyu0990 | 0.333333
+ qwertyu0991 | 0.333333
+ qwertyu0992 | 0.333333
+ qwertyu0993 | 0.333333
+ qwertyu0994 | 0.333333
+ qwertyu0995 | 0.333333
+ qwertyu0996 | 0.333333
+ qwertyu0997 | 0.333333
+ qwertyu0998 | 0.333333
+ qwertyu0999 | 0.333333
+(110 rows)
+
+select t,similarity(t,'gwertyu1988') as sml from test_trgm where t % 'gwertyu1988' order by sml desc, t;
+      t      |   sml    
+-------------+----------
+ qwertyu0988 | 0.333333
+(1 row)
+

contrib/pg_trgm/pg_trgm.sql.in

@@ -36,7 +36,7 @@ CREATE OPERATOR % (
         JOIN = contjoinsel
 );
 
---gist key
+-- gist key
 CREATE FUNCTION gtrgm_in(cstring)
 RETURNS gtrgm
 AS 'MODULE_PATHNAME'
@@ -53,7 +53,7 @@ CREATE TYPE gtrgm (
         OUTPUT = gtrgm_out
 );
 
--- support functions
+-- support functions for gist
 CREATE FUNCTION gtrgm_consistent(gtrgm,internal,int4)
 RETURNS bool
 AS 'MODULE_PATHNAME'
@@ -89,7 +89,7 @@ RETURNS internal
 AS 'MODULE_PATHNAME'
 LANGUAGE C;
 
--- create the operator class
+-- create the operator class for gist
 CREATE OPERATOR CLASS gist_trgm_ops
 FOR TYPE text USING gist
 AS
@@ -103,5 +103,31 @@ AS
         FUNCTION        7       gtrgm_same (gtrgm, gtrgm, internal),
         STORAGE         gtrgm;
 
+-- support functions for gin
+CREATE FUNCTION gin_extract_trgm(text, internal)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE C;
+
+CREATE FUNCTION gin_extract_trgm(text, internal, internal)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE C;
+
+CREATE FUNCTION gin_trgm_consistent(internal, internal, text)
+RETURNS internal
+AS 'MODULE_PATHNAME'
+LANGUAGE C;
+
+-- create the operator class for gin
+CREATE OPERATOR CLASS gin_trgm_ops
+FOR TYPE text USING gin
+AS
+        OPERATOR        1       % (text, text) RECHECK,
+        FUNCTION        1       btint4cmp (int4, int4),
+        FUNCTION        2       gin_extract_trgm (text, internal),
+        FUNCTION        3       gin_extract_trgm (text, internal, internal),
+        FUNCTION        4       gin_trgm_consistent (internal, internal, text),
+        STORAGE         int4;
 
 COMMIT;

contrib/pg_trgm/sql/pg_trgm.sql

@@ -28,3 +28,11 @@ 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;
 
+drop index trgm_idx;
+create index trgm_idx on test_trgm using gin (t gin_trgm_ops);
+set enable_seqscan=off;
+
+select t,similarity(t,'qwertyu0988') as sml from test_trgm where t % 'qwertyu0988' order by sml desc, t;
+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;
+

contrib/pg_trgm/trgm.h

@@ -28,6 +28,7 @@ typedef char trgm[3];
 	*(((char*)(a))+2) = *(((char*)(b))+2);	\
 } while(0);
 
+#define TRGMINT(a) ( (*(((char*)(a))+2)<<16)+(*(((char*)(a))+1)<<8)+*(((char*)(a))+0) )
 
 typedef struct
 {

contrib/pg_trgm/trgm_gin.c

+#include "trgm.h"
+
+#include "access/gin.h"
+#include "access/itup.h"
+#include "access/tuptoaster.h"
+#include "storage/bufpage.h"
+#include "utils/array.h"
+#include "utils/builtins.h"
+
+PG_FUNCTION_INFO_V1(gin_extract_trgm);
+Datum		gin_extract_trgm(PG_FUNCTION_ARGS);
+
+PG_FUNCTION_INFO_V1(gin_trgm_consistent);
+Datum		gin_trgm_consistent(PG_FUNCTION_ARGS);
+
+Datum
+gin_extract_trgm(PG_FUNCTION_ARGS)
+{
+	text		*val = (text *) PG_GETARG_TEXT_P(0);
+	int32		*nentries = (int32 *) PG_GETARG_POINTER(1);
+	Datum		*entries = NULL;
+	TRGM		*trg;
+	int4		trglen;
+	
+	*nentries = 0;
+	
+	trg = generate_trgm(VARDATA(val), VARSIZE(val) - VARHDRSZ);
+	trglen = ARRNELEM(trg);
+	
+	if (trglen > 0)
+	{
+		trgm	*ptr;
+		int4	i = 0,
+				item;
+		
+		*nentries = (int32) trglen;
+		entries = (Datum *) palloc(sizeof(Datum) * trglen);
+
+		ptr = GETARR(trg);
+		while (ptr - GETARR(trg) < ARRNELEM(trg))
+		{
+			item = TRGMINT(ptr);
+			entries[i++] = Int32GetDatum(item);
+			
+			ptr++;
+		}
+	}
+
+	PG_RETURN_POINTER(entries);
+}
+
+Datum
+gin_trgm_consistent(PG_FUNCTION_ARGS)
+{
+	bool		*check = (bool *) PG_GETARG_POINTER(0);
+	text		*query = (text *) PG_GETARG_TEXT_P(2);
+	bool		res = FALSE;
+	TRGM		*trg;
+	int4		i,
+				trglen,
+				ntrue = 0;
+	
+	trg = generate_trgm(VARDATA(query), VARSIZE(query) - VARHDRSZ);
+	trglen = ARRNELEM(trg);
+	
+	for (i = 0; i < trglen; i++)
+		if (check[i])
+			ntrue ++;
+
+#ifdef DIVUNION
+	res = (trglen == ntrue) ? true : ((((((float4) ntrue) / ((float4) (trglen - ntrue)))) >= trgm_limit) ? true : false);
+#else
+	res = (trglen == 0) ? false : ((((((float4) ntrue) / ((float4) trglen))) >= trgm_limit) ? true : false);
+#endif
+
+	PG_RETURN_BOOL(res);
+}

contrib/pg_trgm/uninstall_pg_trgm.sql

@@ -20,6 +20,14 @@ DROP FUNCTION gtrgm_consistent(gtrgm,internal,int4);
 
 DROP TYPE gtrgm CASCADE;
 
+DROP OPERATOR CLASS gin_trgm_ops USING gin;
+
+DROP FUNCTION gin_extract_trgm(text, internal);
+
+DROP FUNCTION gin_extract_trgm(text, internal, internal);
+
+DROP FUNCTION gin_trgm_consistent(internal, internal, text);
+
 DROP OPERATOR % (text, text);
 
 DROP FUNCTION similarity_op(text,text);