postgresql - Postgres casting field before applying index -


i have table ~10mln rpws querying date constraint. there's column dt of type date ( format yyyy-mm-dd ). have created index on it: create index dt_dx on table table(dt) . run explain analyze on returned this:

index scan using dt_idx on entities  (cost=0.56..74175.26 rows=218 width=64) (actual time=0.069..0.069 rows=0 loops=1)                                    index cond: ((dt)::text = '2017-07-26'::text)

does mean postgres casting column's data text before comparing values query parameters?


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