"Luiz Gonzaga da Mata" <gonzaga@pbh.gov.br> writes:
> Sees, below, that it seems to have one bug in set transform_null_equals
> or, then, in <> NULL.
transform_null_equals only catches the exact syntax "something = NULL".
It does not touch "something <> NULL". The latter is always going to
yield NULL, by definition.
regards, tom lane