Chao Sun created HIVE-16428:
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Summary: Refactor & fix the logic in HoS mapjoin optimization
Key: HIVE-16428
URL: https://issues.apache.org/jira/browse/HIVE-16428
Project: Hive
Issue Type: Improvement
Reporter: Chao Sun
Assignee: Chao Sun
[The logic for mapjoin optimization in
HoS|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/spark/SparkMapJoinOptimizer.java#L276]
seems unnecessarily complex and (perhaps) buggy. For instance, If
{{bigInputStat}} is null AND the position is not in {{bigTableCandidateSet}},
then the size for the current position will not be counted into the
{{totalSize}}. This seems wrong.
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