Roberto Mello <[EMAIL PROTECTED]> writes:
> and our output was: 
>       date_id | n_sessions_day |  members  | non_members
>      ---------+----------------+-----------+-------------
>             1 |            500 |        30 |   136394044
>             2 |           2000 | 136394612 |   136394612 

In current sources I get the expected results if I write the
CREATE AGGREGATE commands with
        initcond1 = '0');
Although the parser will accept unquoted integers as initcond
inputs, it looks like something downstream is mishandling them,
resulting in an invalid initial value entered into the pg_aggregate
entry for the aggregate.

I'll look into fixing that for 7.1, but in the meantime try putting
quotes around the initial values.

BTW, your agg_if_member function is not very good, because if it gets
more than one input row with member_p = 1 then the result is order-
dependent.  You don't want that.

                        regards, tom lane

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