The following bug has been logged on the website:
Bug reference: 8525
Logged by: Pavel Rosputko
Email address: pavel.rospu...@gmail.com
PostgreSQL version: 9.3.0
Operating system: Linux
Description:
postgres@a2access=# explain (analyze) select * from locations where
text2ltree(coalesce(replace(ancestry, '/', '.'), '')) || id::text <@ '71';
QUERY PLAN
──────────────────────────────────────────────────────────────────────────────────────────────────────────
Seq Scan on locations (cost=0.00..55.65 rows=27 width=90) (actual
time=0.134..3.113 rows=24 loops=1)
Filter: ((text2ltree(COALESCE(replace((ancestry)::text, '/'::text,
'.'::text), ''::text)) || (id)::tex…
…t) <@ '71'::ltree)
Rows Removed by Filter: 1322
note rows=27 and actual rows=24
whereas
postgres@a2access=# explain (analyze) select * from locations where
text2ltree(coalesce(replace(ancestry, '/', '.'), '')) || id::text <@
array['71']::ltree[];
QUERY PLAN
──────────────────────────────────────────────────────────────────────────────────────────────────────────
Seq Scan on locations (cost=0.00..55.65 rows=1 width=90) (actual
time=0.141..3.279 rows=24 loops=1)
Filter: ((text2ltree(COALESCE(replace((ancestry)::text, '/'::text,
'.'::text), ''::text)) || (id)::tex…
…t) <@ '{71}'::ltree[])
Rows Removed by Filter: 1322
-> rows=1
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