Tom Lane wrote:
"Craig A. James" <cjames@xxxxxxxxxxxxxxxx> writes:
CREATE OR REPLACE FUNCTION cansmiles(text) RETURNS text
AS '/usr/local/pgsql/lib/libchem.so', 'cansmiles'
LANGUAGE 'C' STRICT IMMUTABLE;
Umm ... this is a single-argument function.
db=> explain analyze select version_id, 'Brc1ccc2nc(cn2c1)C(=O)O' from version where version.isosmiles = cansmiles('Brc1ccc2nc(cn2c1)C(=O)O', 1);
And this query is invoking some other, two-argument function; which
apparently hasn't been marked IMMUTABLE, else it'd have been folded
to a constant.
Good catch, mystery solved. There are two definitions for this function, the first just a "wrapper" for the second with the latter parameter defaulting to "1". The second definition was missing the "IMMUTABLE" keyword.
Thanks!
Craig
