> I think you are confused about the difference between a NULL constant
> (which would give rise to an A_Const syntax tree node) and a NULL
> syntax tree pointer (which cannot arise from any actual syntactical
> construct, and would only be present if the grammar put it there due
> to lack of any corresponding item in the input).
>
> regards, tom lane
You're right. I will try to provide a patch as soon as possible.
Thanks.
--
Yury Zhuravlev
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company