Re: [DEPARSE] An alias named 'set' on an UPDATE, DELETE or MERGE target does not read back

Hi Tom,

> Another good catch, but here again I find your solution
> overcomplicated and perhaps not very future-proof. Let's just
> emit AS all the time in these statements.

Agreed. The attached v2 writes AS before the alias of an UPDATE,
DELETE or MERGE target every time, as INSERT already does.

The tests are trimmed to UPDATE and DELETE in rules and MERGE in
a BEGIN ATOMIC function body, each with a target aliased "set"
and recreated from its deparsed text. Existing output in rules and
returning changes too, as in UPDATE rules_log AS trgt SET ... . The
full regression suite passes on master.

This changes the deparsed text of every aliased target. AS has been
accepted there in all supported branches, and the code change applies
cleanly to REL_15 through REL_19. I built each branch and ran the
regression tests.

Best regards,
Henson