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Commit f79ebf2a authored by Wenchen Fan's avatar Wenchen Fan Committed by Michael Armbrust
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[SPARK-11370] [SQL] fix a bug in GroupedIterator and create unit test for it 

Before this PR, user has to consume the iterator of one group before process next group, or we will get into infinite loops.

Author: Wenchen Fan <wenchen@databricks.com>

Closes #9330 from cloud-fan/group.
parent 87f28fc2
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