Re: proposal - GROUPING SETS - Mailing list pgsql-hackers

"Pavel Stehule" <pavel.stehule@gmail.com> writes:
> select a, b from t group by grouping sets(a, b);

> is same as:

> select a, NULL from t group by a
> union all
> select NULL, b from t group by b;

Really?  That seems utterly bizarre, not to say pointless.
You sure you read the spec correctly?
        regards, tom lane