Re: NULL safe equality operator

[Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>]

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