Bruce Momjian <pgman@candle.pha.pa.us> writes:
> + <literal>NULL</> values are not indexed by default.
This is quite incorrect. The nulls *are* indexed (at least in btree
indexes); the issue is whether there is any way to use the index to
search for them. I do not think it helps anyone for the documentation
to get this basic point wrong, even if the distinction is subtle.
regards, tom lane