Yay!  You're right!  I wonder why have I forgotten about LANGUAGE SQL. :)
It's 30 seconds vs 5 seconds for CASE ... END insisde PLpgsql vs CASE...END
LANGUAGE SQL. :)  I.e. its almost the same as in-place entered SQL.

Probably because simple SQL functions get inlined by the optimiser.


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TIP 8: explain analyze is your friend

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