Kevin Wilfong created HIVE-3673:
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Summary: Sort merge join not used when join columns have different
names
Key: HIVE-3673
URL: https://issues.apache.org/jira/browse/HIVE-3673
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.10.0
Reporter: Kevin Wilfong
Assignee: Kevin Wilfong
If two tables are joined on columns with different names, the sort merge join
optimization is not applied. E.g.
SELECT /*+ MAPJOIN(b) */ * FROM t1 a JOIN t2 b ON a.key = b.value;
This will not use sort merge join even if t1 and t2 are bucketed and sorted by
key, value respectively.
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