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> i just needed to round some numbers down to 4 decimal places but a quick > search > indicated that postgresql doesn't support all of the rounding methods so i had > to write this dreadful function: > > create or replace function round_down_to_4_decimal_places(amount > decimal(12,6)) > returns decimal(10,4) stable language sql as $$ ... That should be IMMUTABLE not STABLE. > this is fine for my purposes but it's not generic to different numbers of > decimal > places and it's 26 times slower than the built-in round(v numeric, s int). > strangely, a plpgsql version is much faster but it's still 11 times slower > than > a built-in version would be. ... Yes, but is that speed really noticeable, or is it just a rounding error (ha ha ha!) compared to the total time of a query that uses these? > are there any plans to support any other rounding methods natively? Probably not; it would be up to you to champion them here first. First thing would be to demonstrate a clear use case. That may be hard, as I have no heard of anyone else needing these, and rare features that can be handled by extensions, user written functions, etc. are not likely to be added to core. But who knows, there may be a valid use case. First thing I would do is try a wrapper to a Python or Perl function, mark it IMMUTABLE, and see just how slow it really is. - -- Greg Sabino Mullane g...@turnstep.com End Point Corporation http://www.endpoint.com/ PGP Key: 0x14964AC8 201201251316 http://biglumber.com/x/web?pk=2529DF6AB8F79407E94445B4BC9B906714964AC8 -----BEGIN PGP SIGNATURE----- iEYEAREDAAYFAk8gRzEACgkQvJuQZxSWSsiFzgCfQdA/3sb8Y5eL6z59pR8EZQq7 ioYAoMjKXhrFlHjfSq/eSbvhKa1y+F+u =swla -----END PGP SIGNATURE----- -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
