On 10/17/16 11:29 AM, Tom Lane wrote:
> Jim Nasby <Jim.Nasby@bluetreble.com> writes:
>> On 10/16/16 3:13 PM, Tom Lane wrote:
>>>> Related to this I'd also like to add a boolean XOR operator as that's a
>>>> relatively common request/question.
>
>>> We have boolean XOR; it's spelled "<>".
>
>> I always forget about that...
>
> Maybe it should be mentioned explicitly in the docs.
Hrm, went to go add it and it appears we don't have a section for
boolean type operators. I guess I should add it to 9.1?
>> though, it doesn't work for boolean arrays.
>
> Define doesn't work?
I would expect array[true, false] XOR array[true, true] to return
array[false, true], but <> just returns a single true (since the arrays
are !=).
Though, I guess what would make the most sense there is a map function
that would apply an operator or function to every element of a set of
arrays. But I don't see any way to do that without major changes to how
anyarray works.
--
Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX
Experts in Analytics, Data Architecture and PostgreSQL
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