Chaoyu Tang created HIVE-12812:
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Summary: Enable mapred.input.dir.recursive by default to support
union with aggregate function
Key: HIVE-12812
URL: https://issues.apache.org/jira/browse/HIVE-12812
Project: Hive
Issue Type: Bug
Components: Hive
Affects Versions: 1.2.1, 2.1.0
Reporter: Chaoyu Tang
Assignee: Chaoyu Tang
When union remove optimization is enabled, union query with aggregate function
writes its subquery intermediate results to subdirs which needs
mapred.input.dir.recursive to be enabled in order to be fetched. This property
is not defined by default in Hive and often ignored by user, which causes the
query failure and is hard to be debugged.
So we need set mapred.input.dir.recursive to true whenever union remove
optimization is enabled.
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