Allan Wang <[EMAIL PROTECTED]> writes:
> It seems that Postgres is estimating that all rows in a 50k row table
> will be returned, but only one should match.

I think this is the same issue fixed here:

2005-04-03 21:43  tgl

        * src/backend/optimizer/path/: costsize.c (REL7_4_STABLE),
        costsize.c (REL8_0_STABLE), costsize.c: In cost_mergejoin, the
        early-exit effect should not apply to the outer side of an outer
        join.  Per [EMAIL PROTECTED]

Are you running 7.4.8 or 8.0.2 or later?

                        regards, tom lane

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