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Use GIST index on search terms

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Tom Russell 2019-02-05 13:37:32 +00:00
parent 731f299a18
commit 8724ccd93b
1 changed files with 2 additions and 2 deletions
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migrations/008.search.up.sql
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@ -25,7 +25,7 @@ CREATE TABLE IF NOT EXISTS search_locations (
-- - SELECT * FROM search_locations WHERE search_str ILIKE 'e1%' -- - SELECT * FROM search_locations WHERE search_str ILIKE 'e1%'
-- - SELECT *, search_str <-> 'searchterm' AS dist FROM search_locations ORDER BY dist LIMIT 5; -- - SELECT *, search_str <-> 'searchterm' AS dist FROM search_locations ORDER BY dist LIMIT 5;
-- - SELECT *, similarity(search_str, 'searchterm') AS dist FROM search_locations -- - SELECT *, similarity(search_str, 'searchterm') AS dist FROM search_locations
-- WHERE t % 'searchterm' ORDER BY dist DESC, t LIMIT 5; -- WHERE t % 'searchterm' ORDER BY dist ASC, t LIMIT 5;
-- Docs suggest the second query will perform better than the third, when only a small number -- Docs suggest the second query will perform better than the third, when only a small number
-- of closest matches are desired, if combined with a GIST index (not GIN as below), -- of closest matches are desired, if combined with a GIST index (not GIN as below),
CREATE INDEX trgm_idx_search_str ON search_locations USING GIN (search_str gin_trgm_ops); CREATE INDEX trgm_gist_idx_search_str ON search_locations USING GIST (search_str gist_trgm_ops);