On 10/28/2016 03:14 PM, Tom Lane wrote:
Andrew Dunstan <and...@dunslane.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.



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