FYI, this will be fixed in 6.5.
> I'm just installing 6.5 and I did a dump/restore of a database that I
> had in 6.4.2. This database has a field with a box type which is
> indexed with an r-tree index. The dump/restore went OK, but when I
> tried to run a query against it, I got a weird error:
>
> ERROR: Operator 500 must have a restriction selectivity estimator to be
> used in a btree index
>
> This may not seem like a weird error to some, but why am I getting a
> b-tree error on an r-tree index?
> Anybody know anything about this?
>
>
--
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