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Handle equality operator in contrib/pg_trgm

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Obviously, in order to equality operator be satisfiable, target string must
contain all the trigrams of the search string.  On this base, we implement
equality operator in GiST/GIN indexes with recheck.

Discussion: https://postgr.es/m/CAOBaU_YWwtT7tdggtROacjdOdeYHCz-tmSwuC-j-TOG-g97J0w%40mail.gmail.com
Author: Julien Rouhaud
Reviewed-by: Tom Lane, Alexander Korotkov, Georgios Kokolatos, Erik Rijkers
This commit is contained in:
Alexander Korotkov
2020-11-15 08:52:12 +03:00
parent 92bf7e2d02
commit 935f666650
9 changed files with 264 additions and 10 deletions
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4
contrib/pg_trgm/trgm_gist.c
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@ -232,6 +232,7 @@ gtrgm_consistent(PG_FUNCTION_ARGS)
case SimilarityStrategyNumber:
case WordSimilarityStrategyNumber:
case StrictWordSimilarityStrategyNumber:
case EqualStrategyNumber:
qtrg = generate_trgm(VARDATA(query),
querysize - VARHDRSZ);
break;
@ -338,7 +339,8 @@ gtrgm_consistent(PG_FUNCTION_ARGS)
#endif
/* FALL THRU */
case LikeStrategyNumber:
/* Wildcard search is inexact */
case EqualStrategyNumber:
/* Wildcard and equal search are inexact */
*recheck = true;
/*