Re: Ordered Append Node

* Markus Schiltknecht:

>> You need a priority queue to figure out from which tape (partition)
>> you need to remove the next tuple.
>
> And why do you need lots of heap memory to do that? Anything wrong
> with the zipper approach I've outlined upthread?

"heap" == "priority queue" here, I guess.  Looking at your zipper
again, it's actually an implementation of a heap.

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