Greg Smith <greg(at)2ndQuadrant(dot)com> writes:
> That weird casting can't be helping. I'm not sure if it's your problem
> here, but the constraint exclusion code is pretty picky about matching
> the thing you're looking for against the CHECK constraint, and this is a
> messy one. The bigint conversion in the middle there isn't doing
> anything useful for you anyway; you really should simplify this to just
> look like this:
> firstloadtime >= 129604464000000000::numeric
I have a more aggressive suggestion: change all the numeric(20,0) fields
to bigint. Unless the OP actually needs values wider than 64 bits,
the choice to use numeric is a significant performance penalty for
nothing.
regards, tom lane