Kevin Wilfong created HIVE-3467:
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Summary: BucketMapJoinOptimizer should optimize joins on partition
columns
Key: HIVE-3467
URL: https://issues.apache.org/jira/browse/HIVE-3467
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 0.10.0
Reporter: Kevin Wilfong
Consider the query:
SELECT * FROM t1 JOIN t2 on t1.part = t2.part and t1.key = t2.key;
Where t1 and t2 are partitioned by part and bucketed by key.
Suppose part take values 1 and 2 and t1 and t2 are bucketed into 2 buckets.
The bucket map join optimizer will put the first bucket of part=1 and part=2
partitions of t2 into the same mapper as that of part=1 partition of t1. It
will do the same for the part=2 partition of t1.
It could take advantage of the partition values and send the first bucket of
only the part=1 partitions of t1 and t2 into one mapper and the first bucket of
only the part=2 partitions into another.
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