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Commit 14d08b99 authored by Wenchen Fan's avatar Wenchen Fan Committed by Michael Armbrust
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[SPARK-11393] [SQL] CoGroupedIterator should respect the fact that... 

[SPARK-11393] [SQL] CoGroupedIterator should respect the fact that GroupedIterator.hasNext is not idempotent

When we cogroup 2 `GroupedIterator`s in `CoGroupedIterator`, if the right side is smaller, we will consume right data and keep the left data unchanged. Then we call `hasNext` which will call `left.hasNext`. This will make `GroupedIterator` generate an extra group as the previous one has not been comsumed yet.

Author: Wenchen Fan <wenchen@databricks.com>

Closes #9346 from cloud-fan/cogroup and squashes the following commits:

9be67c8 [Wenchen Fan] SPARK-11393
parent 59db9e9c
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