handling of COUNT(record) vs IS NULL

[Sam Mason <sam(at)samason(dot)me(dot)uk>]

Hi,

I've just noticed that the handling of COUNT(record) and (record IS
NULL) aren't consistent with my understanding of them.  If I run the
following query:

  SELECT
     NULL       IS NULL, COUNT( NULL      ),
    (NULL,NULL) IS NULL, COUNT((NULL,NULL));

The IS NULL checks both return TRUE as I'd expect them to, but the
second count doesn't return 0.

The Comparison Operator docs[1] describe the behaviour of IS NULL
changing, with respect to records, in version 8.2.  Is count still
exhibiting the old behaviour?


  Sam

 [1] http://www.postgresql.org/docs/8.2/static/functions-comparison.html