Re: RULE regression test fragility?

Robert Haas <robertmhaas@gmail.com> writes:
> ... we could leave the parentheses out in
> whichever case it's equivalent to.

Ah, I see what you're getting at now.  Yeah, that might be a useful
readability improvement.

> ... I fairly commonly
> write queries that involve multiple UNION ALL branches and, no matter
> how clever we are, having that lead to progressively deeper nesting at
> each level is not going to look nice.

Agreed.  I was wondering myself whether we couldn't fix things so that
all the branches are indented the same, even with parens.
        regards, tom lane