Fabien COELHO <coelho@cri.ensmp.fr> writes:
> I'm looking into adding sql standard aggregates EVERY/ANY/SOME.
> It seems to me that there is a syntax ambiguity with ANY and SOME:
> CREATE TABLE bla(b BOOL);
> SELECT TRUE = ANY(b) FROM bla;
AFAICS this ambiguity is built into the SQL standard, and in fact it's
possible to generate cases that are legally parseable either way:
SELECT foo.x = ANY((SELECT bar.y FROM bar)) FROM foo;
The parenthesized sub-select could be a plain <value expression>,
in which case ANY must be an aggregate function call, or we could
regard it as a <table subquery>, in which case we've got a <quantified
comparison predicate>. These interpretations could both work, if the
sub-select yields only one row, but they won't necessarily give the same
answer.
So I think that the SQL committee shot themselves in the foot when they
decided it was a good idea to call the boolean-OR aggregate "ANY", and
our addition of an array option isn't the fundamental problem.
Anyone know if SQL2003 fixed this silliness?
regards, tom lane
