On tis, 2011-03-08 at 17:43 -0500, Tom Lane wrote:
> Mph. Well, I guess in the case of the pg_statistic stats we can
> declare by fiat that we calculate the stats according to the default
> collation. They'll be a bit off when used for a query that is
> comparing according to some other collation, but it's probably no
> worse than any other approximation we make in the selectivity code.
That was my assumption for the time being.
Unfortunately, it's hard to create test coverage for these types of
issues.