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