Index Cond: (to_tsvector( 'english '::regconfig, text) ' ' 'field ' ' & ' 'window ' ' & ' 'l ' ':* '::tsquery) Heap Blocks: exact = 4 - > Bitmap Index Scan on ix_en_document_tsvector_text (cost = 0. Recheck Cond: ((to_tsvector( 'english '::regconfig, text) ' ' 'field ' ' & ' 'window ' ' & ' 'l ' ':* '::tsquery) AND ((language):: text = 'en ':: text)) 27 rows = 1 width = 102) (actual time = 5. To_tsvector( 'english ', text) to_tsquery( 'english ', 'fielded & window & l:* ')īitmap Heap Scan on document (cost = 168. It can be useful to execute full text search during typing a word. 590 ms Tsearch full text search for partial words Index Cond: (to_tsvector( 'english '::regconfig, text) ' ' 'field ' ' & ' 'window ' ' & ' 'lamp ' ' & ' 'depth ' ' & ' 'test ' ' '::tsquery)Įxecution Time: 0. > Bitmap Index Scan on ix_en_document_tsvector_text (cost = 0. Recheck Cond: ((to_tsvector( 'english '::regconfig, text) ' ' 'field ' ' & ' 'window ' ' & ' 'lamp ' ' & ' 'depth ' ' & ' 'test ' ' '::tsquery) AND ((language):: text = 'en ':: text)) 27 rows = 1 width = 103) (actual time = 0. > Bitmap Heap Scan on document (cost = 64. To_tsvector( 'english ', text) to_tsquery( 'english ', 'fielded & window & lamp & depth & test ') We have to add to query a condition that was used to create partial index: document.language = 'en': As a result, parameterized query clauses do not work with a partial index. Matching takes place at query planning time, not at run time. Otherwise the predicate condition must exactly match part of the query's WHERE condition or the index will not be recognized as usable. The system can recognize simple inequality implications, for example "x < 1" implies "x < 2" (Not only is such a general theorem prover extremely difficult to create, it would probably be too slow to be of any real use.) PostgreSQL does not have a sophisticated theorem prover that can recognize mathematically equivalent expressions that are written in different forms. To be precise, a partial index can be used in a query only if the system can recognize that the WHERE condition of the query mathematically implies the predicate of the index. However, keep in mind that the predicate must match the conditions used in the queries that are supposed to benefit from the index. 419 rows = 0 loops = 2)įilter: (to_tsvector( 'english '::regconfig, text) ' ' 'field ' ' & ' 'window ' ' & ' 'lamp ' ' & ' 'depth ' ' & ' 'test ' ' '::tsquery) Workers Launched: 1 - > Parallel Seq Scan on document (cost = 0. document USING gin (to_tsvector( 'english '::regconfig, text)) WHERE language = 'en ' > CREATE INDEX ix_en_document_tsvector_text ON public. Partial index gives as a possibility to store records in different languages using one table and query them effectively. ( 9 rows) Tsearch full text search with stored partial index 644 rows = 0 loops = 2)įilter: (((language):: text = 'en ':: text) AND (to_tsvector( 'english '::regconfig, text) ' ' 'field ' ' & ' 'window ' ' & ' 'lamp ' ' & ' 'depth ' ' & ' 'test ' ' '::tsquery)) document WHERE to_tsvector( 'english ', text) to_tsquery( 'english ', 'fielded & window & lamp & depth & test ') There also must be created a configuration (see the docs) inside database:įROM public. To determin your sharedir location you can use pg_config -sharedir Polish.affix, polish.stop and polish.dict files should be copied to postgresql sharedir tsearch_data location,Į.g. Polish dictionary files can be downloaded from. You just need additional dictionary files. Postgres does not provide support for many languages by default. 524 ms Create non-default language configuration for tsearch full text search Index Cond: (( text ~~ * '%field% ':: text) AND ( text ~~ * '%window% ':: text) AND ( text ~~ * '%lamp% ':: text) AND ( text ~~ * '%research% ':: text))Įxecution Time: 1. > Bitmap Index Scan on ix_document_text_trigram (cost = 0. Recheck Cond: (( text ~~ * '%field% ':: text) AND ( text ~~ * '%window% ':: text) AND ( text ~~ * '%lamp% ':: text) AND ( text ~~ * '%research% ':: text) AND ((language):: text = 'en ':: text)) 02 rows = 1 width = 105) (actual time = 1. > Bitmap Heap Scan on document (cost = 176. document WHERE text ilike '%field% ' AND text ilike '%window% ' AND text ilike '%lamp% ' AND text ilike '%research% ' AND language = 'en ' LIMIT 1 CREATE INDEX ix_document_text_trigram ON document USING gin ( text gin_trgm_ops) where language = 'en ' įROM public.
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