> On Jun 18, 2019, at 7:37 PM, Alvaro Herrera <alvherre@xxxxxxxxxxxxxxx> wrote: > > On 2019-Jun-18, Rob Nikander wrote: > >> Does `array_append(arr, elt)` create a new array and copy everything? >> In other words, is it O(n) or O(1)? […] > > Starting with 9.5, there's an optimization that I think is supposed to > make it O(1): Sweet! Thanks. Now I’d like to know how to tell if that optimization is being used, or not. Same question for the a way to pop an element off the end in O(1) time.
