Thread: Typo in 2.7 Aggregate Functions

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/15/tutorial-agg.html
Description:

Near the end of Chapter 2.7 Aggregate Functions of the documentation, the
command FILTER is introduced. The full query is

SELECT city, max(temp_lo), count(*) FILTER (WHERE temp_lo < 30)
    FROM weather
    GROUP BY city
    HAVING max(temp_lo) < 40;

and the output shows a count value of 5. This is an error.

In total we only have 3 rows in the table so far. Furthermore, none of the
rows have temp_lo < 30. If I'm not mistaken, the count value should be 0.

Thanks,
Jimmy

PG Doc comments form <noreply@postgresql.org> writes:
> Near the end of Chapter 2.7 Aggregate Functions of the documentation, the
> command FILTER is introduced. The full query is

> SELECT city, max(temp_lo), count(*) FILTER (WHERE temp_lo < 30)
>     FROM weather
>     GROUP BY city
>     HAVING max(temp_lo) < 40;

> and the output shows a count value of 5. This is an error.

Yeah :-(.  This is already fixed in our source tree [1], as you
can see on the website if you look at the "devel" branch.  But the
released-version docs won't update till our next releases, in
February.

Thanks for the report, anyway!

            regards, tom lane

[1] https://git.postgresql.org/gitweb/?p=postgresql.git&a=commitdiff&h=f05a5e0003edfec027ee10d09082667036862e1c