If you have only recently analyzed the tables in the query, close your psql
session (if that's what you were using) and then restart it. I've gotten burned
by asking a query using the function, which I believe is when PG creates the
plan for the function, and then making significant changes to the tables behind
it (new index, bulk insert, etc.). By starting a new session, the function will
be re-planned according to up to date statistics or using newly created indices.
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