Rui Li created HIVE-9097:
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Summary: Support runtime skew join for more queries [Spark Branch]
Key: HIVE-9097
URL: https://issues.apache.org/jira/browse/HIVE-9097
Project: Hive
Issue Type: Bug
Reporter: Rui Li
After HIVE-8913, runtime skew join is enabled for spark. But currently the
optimization only supports the simplest case where join is the leave ReduceWork
in a work graph. This is because the results from the original join and the
conditional map join have to be unioned to feed to downstream works, which can
be a little tricky for spark.
This JIRA is to research and find a way to relax the above restriction. A
possible solution is to break the original task into two tasks on the join
work, and insert the conditional task in between.
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