Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/8888#issuecomment-142783827
@andrewor14 that's actually what I mean, if we didn't reserve the memory
when creating the down streaming operator, we probably never get the chance to
acquire the page when inserting records to `sorter`, as the upstreaming
operator (like SMJ) probably eat out all of the memory, which even lead to the
hash aggregation switching to sort-based aggregation when first record comes.
Do you think that's possible?
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