| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au> |
| Cc: | Michael Glaesemann <grzm(at)myrealbox(dot)com>, Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: NULL safe equality operator |
| Date: | 2005-11-25 15:23:41 |
| Message-ID: | 22284.1132932221@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au> writes:
>> test=# select null_safe_cmp (NULL,NULL);
>> ERROR: could not determine anyarray/anyelement type because input has
>> type "unknown"
>> Same casting problem due to anyelement, of course.
> Yes - I wonder what the trick to getting around that is?
You might be able to hack it by creating a second function defined as
null_safe_cmp(unknown,unknown)
Pretty grotty of course, and I'm not sure that it comes up in the
real world as opposed to test cases.
regards, tom lane
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