Re: optimizer/clauses.h needn't include access/htup.h

Justin Pryzby <pryzby@telsasoft.com> writes:
> It was only needed between these:
> commit a8677e3ff6bb8ef78a9ba676faa647bba237b1c4
> commit f09346a9c6218dd239fdf3a79a729716c0d305bd

Hm, you're right.  Removed.

> I noticed while looking at "what includes what" and wondered if some of these
> are kind of "modularity violations".

Yeah.  I've ranted before that we ought to have some clearer idea of
module layering within the backend, and avoid cross-header inclusions
that would break the layering.  This particular case didn't really
do so, I suppose, since htup.h would surely be on a lower level than
the optimizer.  But it still seems nicer to not have that inclusion.

Anyway, if you're feeling motivated to explore a more wide-ranging
refactoring, by all means have a go at it.

            regards, tom lane