[HIVE-12812] Enable mapred.input.dir.recursive by default to support union with aggregate function - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: 1.2.1, 2.1.0
Fix Version/s: 4.0.0-alpha-1
Component/s: Hive
Labels:
None

Description

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.