Re: POC, WIP: OR-clause support for indexes - Mailing list pgsql-hackers

On Mon, Oct 7, 2024 at 12:02 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Peter Geoghegan <pg@bowt.ie> writes:
> > To be clear, I don't think that it's essential that we have equivalent
> > behavior in those cases where the patch applies its transformations. I
> > have no objections to committing the patch without any handling for
> > that.
>
> Oy.  I don't agree with that *at all*.  An "optimization" that changes
> query semantics is going to be widely seen as a bug.

I think everyone agrees on that. The issue is that I don't know how to
implement the optimization Peter wants without changing the query
semantics, and it seems like Alexander doesn't either. By committing
the patch without that optimization, we're *avoiding* changing the
query semantics.

--
Robert Haas
EDB: http://www.enterprisedb.com