Github user ppadma commented on the issue:
https://github.com/apache/drill/pull/639
Parallelization logic is affected for following reasons:
Depending upon how many rowGroups to scan on a node (based on locality
information) i.e. how much work the node has to do, we want to adjust the
number of fragments on the node (constrained to usual global and per node
limits).
We do not want to schedule fragment(s) on a node which do not have data.
Because we want pure locality, we may have fewer fragments doing more work.
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