Re: Allow to collect statistics on virtual generated columns

On Thu, 26 Mar 2026 16:00:38 +0000
Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> wrote:

> On Thu, 26 Mar 2026 at 15:09, Yugo Nagata <nagata(at)sraoss(dot)co(dot)jp> wrote:
> >
> > I've attached an updated patch including the documentation and tests.
>
> I think this is a much better approach.
>
> One thing that stands out in CreateStatistics() is that the check for
> a less-than operator can be skipped if there is just a single virtual
> generated column, for the same reason as for statistics on a single
> expression. I.e., it should be possible to build statistics on a
> single virtual generated column of any data type.

I've attached a revised patch to skip the less-than operator check
for a single virtual generated column.

In fact, this change skips the check for any single column,
not just virtual generated columns. However, using a non-virtual
single column will result in an error elsewhere.

Regards,
Yugo Nagata

--
Yugo Nagata <nagata(at)sraoss(dot)co(dot)jp>