Github user vrozov commented on the issue:
https://github.com/apache/drill/pull/1237
IMO, it is better not to report memory usage at all compared to reporting a
wrong number. In case incoming batches are accumulated in a queue, they should
be reported as owned by a receiver. Taking ownership just before passing a
batch to the next operator does not sound right to me.
I don't think it is necessary to create new fragment child allocator.
Receiver allocator should be used instead of fragment allocator when an
incoming batch is placed into a queue.
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