On Wed, Jun 15, 2016 at 1:45 PM, Alvaro Herrera
> Maybe it is possible to get into trouble if you're taking a sample for
> an expression index.
Maybe -- if you are using a function for an index expression which
does an explicit SELECT against some database table rather than
only using values from the row itself. In such a case you would
have had to mark a function as IMMUTABLE which depends on table
contents. I say you get to keep both pieces.
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