"D. Duccini" <[EMAIL PROTECTED]> writes:
> I think we found a way around it!

> CREATE OR REPLACE FUNCTION date_immutable( timestamptz ) RETURNS date AS
> 'SELECT date( $1 ) ;' LANGUAGE 'sql' IMMUTABLE ;

No, you just found a way to corrupt your index.  Pretending that
date(timestamptz) is immutable does not make it so.  The above
*will* break the first time someone uses the table with a different
timezone setting.

What you can do safely is date(footime AT TIME ZONE 'something'),
since this nails down the zone in which the date is interpreted.

                        regards, tom lane

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