Sam Mason <s...@samason.me.uk> writes:
> ... PG should instead arrange that the expression
> "t" is run exactly once and reuse the single result for all columns.

We might be able to do that based on the row-returning-subselect
infrastructure being discussed over here:
http://archives.postgresql.org/message-id/4087.1250867...@sss.pgh.pa.us
Don't hold your breath though ...

                        regards, tom lane

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