For example, IIRC when joining an integer column with a SERIAL column,
you must expicitly cast it as an integer or the planner will not use
the indexes, right? (This is a guess, as I remember reading something
like this and thinking, "How in the world is someone supposed to
figure that out, even with EXPLAIN?")

That's not true at all. Perhaps you're thinking about BIGSERIAL and int8 indexes - something that's been addressed in 8.0.


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