Re: Issues with generate_series using integer boundaries

On 3 February 2011 13:32, Thom Brown <thom(at)linux(dot)com> wrote:
> Actually, further testing indicates this causes other problems:
>
> postgres=# SELECT x FROM generate_series(1, 9,-1) AS a(x);
>  x
> ---
>  1
> (1 row)
>
> Should return no rows.
>
> postgres=# SELECT x FROM generate_series(1, 9,3) AS a(x);
>  x
> ----
>  1
>  4
>  7
>  10
> (4 rows)
>
> Should return 3 rows.

Still messy code, but the attached patch does the job now:

postgres=# SELECT x FROM
generate_series(2147483643::int4,2147483647::int4) AS a(x);
x
------------
2147483643
2147483644
2147483645
2147483646
2147483647
(5 rows)

postgres=# SELECT x FROM
generate_series(2147483642::int4,2147483647::int4, 2) AS a(x);
x
------------
2147483642
2147483644
2147483646
(3 rows)

postgres=# SELECT x FROM
generate_series(2147483643::int4,2147483647::int4, 6) AS a(x);
x
------------
2147483643
(1 row)

postgres=# SELECT x FROM generate_series((-2147483643)::int4,
(-2147483648)::int4, -1) AS a(x);
x
-------------
-2147483643
-2147483644
-2147483645
-2147483646
-2147483647
-2147483648
(6 rows)

postgres=# SELECT x FROM generate_series(1, 9,-1) AS a(x);
x
---
(0 rows)

postgres=# SELECT x FROM generate_series(1, 9,3) AS a(x);
x
---
1
4
7
(3 rows)

--
Thom Brown
Twitter: @darkixion
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