| From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
|---|---|
| To: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Numeric x^y for negative x |
| Date: | 2021-06-29 11:08:01 |
| Message-ID: | CAEZATCW6Dvq7+3wN3tt5jLj-FyOcUgT5xNoOqce5=6Su0bCR0w@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Numeric x^y is supported for x < 0 if y is an integer, but this
currently fails if y is outside the range of an int32:
SELECT (-1.0) ^ 2147483647;
?column?
---------------------
-1.0000000000000000
(1 row)
SELECT (-1.0) ^ 2147483648;
ERROR: cannot take logarithm of a negative number
because only the power_var_int() code path in power_var() handles
negative bases correctly. Attached is a patch to fix that.
Regards,
Dean
| Attachment | Content-Type | Size |
|---|---|---|
| numeric-pow-negative-base.patch | text/x-patch | 3.7 KB |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | John Naylor | 2021-06-29 11:20:38 | Re: speed up verifying UTF-8 |
| Previous Message | Amit Kapila | 2021-06-29 11:07:27 | Re: Refactor "mutually exclusive options" error reporting code in parse_subscription_options |