Re: Re: Planner chooses slow index heap scan despite accurate row estimates - Mailing list pgsql-performance

Jake Magner <jakemagner90@gmail.com> writes:
> I tried without doing an INSERT at all, just running the SELECT queries and
> the result is the same. Nested loop is chosen but is much slower.

FWIW, I just noticed that the comparisons you're using are plain equality
of the arrays.  While a GIN array index supports that, it's not exactly
its strong suit: the sort of questions that index type supports well are
more like "which arrays contain value X?".  I wonder if it'd be worth
creating btree indexes on the array column.

            regards, tom lane