On 10/28/2016 03:14 PM, Tom Lane wrote:
> Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
>> My initial admittedly ugly thought was why not have a second append
>> function that doesn't use expanded arrays?
> That won't get us out of the O(N^2) behavior. Also I don't see what's
> better about it than my suggestion of making array_append itself do
> that when called as an aggregate function.
>
>
Probably nothing, I was just thinking out loud. That suggestion seems
like the most obviously back-patchable solution.
cheers
andrew