This simple function return setof table "DatiRegione"
CREATE OR REPLACE FUNCTION public._stato_dati_regione_rt(text) RETURNS SETOF "DatiRegione" AS ' SELECT DISTINCT ON ("Codice_regione") dr.* FROM "DatiRegione" ' LANGUAGE 'sql' VOLATILE STRICT;
When I perform query on this setof, pgsql not use the indexes on table "DatiRegion".
This is a big problem.
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Query on _stato_dati_regione_rt(text) without index
QUERY PLAN
Aggregate (cost=17.50..17.51 rows=1 width=17) (actual time=14555.295..14555.297 rows=1 loops=1)
-> Function Scan on _stato_dati_regione_rt (cost=0.00..17.50 rows=1 width=17) (actual time=14528.756..14554.753 rows=119 loops=1)
Filter: (("Categoria" = 1) AND ("Tipologia" = 'ALB'::bpchar))
Total runtime: 14561.981 ms
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Query on "DatiRegione" with index
QUERY PLAN
Aggregate (cost=672.10..672.10 rows=1 width=17) (actual time=8.752..8.753 rows=1 loops=1)
-> Index Scan using idx_dr_cat_tipo on "DatiRegione" (cost=0.00..671.64 rows=181 width=17) (actual time=0.123..6.289 rows=504 loops=1)
Index Cond: (("Categoria" = 1) AND ("Tipologia" = 'ALB'::bpchar))
Total runtime: 9.565 ms
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Can I use index on setof from _stato_dati_regione_rt(text)?
Tannks in adbace.
By,Alessandro
-- ------------------------------- Alessandro Vincelli W4B - web for business s.r.l. Firenze via Pellicceria 10 - 50123 E-mail: a.vincelli@xxxxxx tel: 055-2654270
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