John A Meinel <[EMAIL PROTECTED]> writes:
> Unfortunately, because Hash Join doesn't report the number of rows
> (rows=0 always), it's hard to tell how good the estimator is.

This is only a cosmetic problem because you can just look at the number
of rows actually emitted by the Hash node's child; that's always exactly
the number loaded into the hashtable.

(But having said that, it is fixed in CVS tip.)

You may be confused though --- the Hash node is not the Hash Join node.
A zero report from Hash Join does actually mean that it emitted zero

                        regards, tom lane

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