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Add strict_word_similarity to pg_trgm module

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strict_word_similarity is similar to existing word_similarity function but
it takes into account word boundaries to compute similarity.

Author: Alexander Korotkov
Review by: David Steele, Liudmila Mantrova, me
Discussion: https://www.postgresql.org/message-id/flat/CY4PR17MB13207ED8310F847CF117EED0D85A0@CY4PR17MB1320.namprd17.prod.outlook.com
This commit is contained in:
Teodor Sigaev
2018-03-21 14:57:42 +03:00
parent f20b328534
commit be8a7a6866
10 changed files with 1461 additions and 61 deletions
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9
contrib/pg_trgm/trgm_gin.c
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@ -90,6 +90,7 @@ gin_extract_query_trgm(PG_FUNCTION_ARGS)
{
case SimilarityStrategyNumber:
case WordSimilarityStrategyNumber:
case StrictWordSimilarityStrategyNumber:
trg = generate_trgm(VARDATA_ANY(val), VARSIZE_ANY_EXHDR(val));
break;
case ILikeStrategyNumber:
@ -187,8 +188,8 @@ gin_trgm_consistent(PG_FUNCTION_ARGS)
{
case SimilarityStrategyNumber:
case WordSimilarityStrategyNumber:
nlimit = (strategy == SimilarityStrategyNumber) ?
similarity_threshold : word_similarity_threshold;
case StrictWordSimilarityStrategyNumber:
nlimit = index_strategy_get_limit(strategy);
/* Count the matches */
ntrue = 0;
@ -282,8 +283,8 @@ gin_trgm_triconsistent(PG_FUNCTION_ARGS)
{
case SimilarityStrategyNumber:
case WordSimilarityStrategyNumber:
nlimit = (strategy == SimilarityStrategyNumber) ?
similarity_threshold : word_similarity_threshold;
case StrictWordSimilarityStrategyNumber:
nlimit = index_strategy_get_limit(strategy);
/* Count the matches */
ntrue = 0;