On Wed, Jul 20, 2005 at 08:11:46PM -0400, Paul Tillotson wrote:
> Tom Lane wrote:
> >Hardly likely, considering it's estimating only 296 rows in the subquery
> >output. My bet is that you've chosen a datatype whose comparisons are
> >not hashable (like char(n)). What is the datatype of parentid in these
> >tables, anyway?
> >
> I don't have access to the machine now, but my memory is that
> parent.parentid is numeric(10,2) and child.parentid is int.
Numeric isn't hashable, but I don't know enough about the internals
to say why. Tom?
Why different types, and why numeric for one of them? Why not
integer for both?
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
