Re: Bug in GiST paring heap comparator

On Mon, Sep 16, 2019 at 3:47 PM Nikita Glukhov <n.gluhov@postgrespro.ru> wrote:
> On 13.09.2019 20:17, Alexander Korotkov wrote:
>
> On Fri, Sep 13, 2019 at 5:23 PM Nikita Glukhov <n.gluhov@postgrespro.ru> wrote:
>
> I have moved handling of NULL ordering keys from opclasses to the common
> SP-GiST code, but really I don't like how it is implemented now. Maybe it's
> worth to move handling of NULL order-by keys to the even more higher
> level so,
> that AM don't have to worry about NULLs?
>
> Yes, optimizer could remove away "col op NULL" clauses from ORDER BY
> if op is strict operator.  And then such clauses wouldn't be passed to
> AM.  But I see this as future improvement.  For backpatching we should
> solve this at AM side.
>
> Also I leaved usages of IndexOrderByDistance in opclasses. I think, that
> may help to minimize opclass changes in the future.
>
> Could you please extract this as a separate patch.  We can consider
> this for master, but we shouldn't backpatch this.
>
> Propagation of IndexOrderByDistance in SP-GiST was extracted into a separate
> patch #2.

First patch is minor editing from me and commit message is attached.
I'm going to push it if no objections.