Aggregate fix

I have applied a fix so we can now do:

    test=> select count(*) from pg_user, pg_type;
    count
    -----
      120
    (1 row)

    test=> select sum(3);
    sum
    ---
      3
    (1 row)

    test=> select count(*) from testview;
    count
    -----
        1
    (1 row)

These were TODO items.  None of the fixes were trivial, and a patch was
posted to the patches list.

I would like 6.3 to be a no-excuses release.  No excuses for missing
features like UNION and subselects(?), and no excuses for buggy
features.

- --
Bruce Momjian
maillist@candle.pha.pa.us

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