Subqueries in Check() -- Still Intentionally Omitted?

I am curious if the motivation is still valid for intentionally
omitting check sub-queries. (what was the motivation to begin with?)

Since we can effectively work around this limitation by doing the same
thing with a function in a CHECK constraint, why would we want to
prevent anyone from using the standard syntax for achieving the same
effect?

As a side point, for consistency I think that the CREATE ASSERTION
feature should have the same comments as a check() sub-query, since it
is very similar in purpose.

http://www.postgresql.org/docs/8.3/interactive/unsupported-features-sql-standard.html
F671 | Enhanced integrity management | Sub queries in CHECK |
intentionally omitted

--
Regards,
Richard Broersma Jr.

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