Re: Add RESPECT/IGNORE NULLS and FROM FIRST/LAST options

> Thank you for the patch. (I noticed int8 is also missing).
>
> I have looked into the commit 964d01ae90c3 which was made by Peter.  I
> have quick read through the discussion to know why uint8/uint16 (and
> int8) are missing in gen_node_support.pl. Unfortunately I have no
> clear idea why these data types are missing in the script.
>
> Peter,
> Maybe you wanted to limit the data types that are actually used at
> that point? If so, probably we should only add uint8 support this time
> (uint8 is only needed to implement $Subject for now).  What do you
> think?

I decided not to include the fix to gen_node_support.pl for now and
commit the patch without it. We could revisit it later on.

So here is the commit message I would like to propose.

For the technical part please look at the message.

Non technical part:
First of all the author is Oliver (no doubt).  I would like to be
listed as a co-author since I wrote the not null cache part.

Next is reviewers. Actually the first effor to implement null
treatment clause was back to 9.3 era (2013) at least. After that
multiple trials to implemnt the feature happend but they had faded
away. I think we don't need to include all of those who joined the old
discussions as reviewers. So I started to check from the discussion:
https://postgr.es/m/flat/CAGMVOdsbtRwE_4+v8zjH1d9xfovDeQAGLkP_B6k69_VoFEgX-A@mail.gmail.com
because it's refered to by the commit fest entry.

Oliver and others, I love to hear your comment!