Deepak Jaiswal created HIVE-19967:
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Summary: SMB Join : ReduceSink should use correct keys in optraits
Key: HIVE-19967
URL: https://issues.apache.org/jira/browse/HIVE-19967
Project: Hive
Issue Type: Task
Reporter: Deepak Jaiswal
Assignee: Deepak Jaiswal
The optraits for ReduceSinkOp used to use the key columns as bucket and sort
columns which worked fine for SMB, however, to enable prefix in Bucket Map
Join, this logic was updated to use the bucket columns from parent operators.
However, this may break reduce side SMB in a scenario like this,
Task1 (TS bucketed by col0), passes it down to RS which ignores the key columns
and uses col0 as bucket key.
Task2 (Set of ops work such that data is sorted by a set of columns), however,
with current logic, the bucketing column set in Task1 keeps getting pushed in
Optraits, thus losing the real flow.
Task3(Join op) The physical optimizer looks at the parent RS ops which
incidentally are sorted by same column as the original Task1's bucket column,
however, in the meantime lost the meaning.
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