Review Request 25720: HIVE-8141:Refactor the GraphTran code by moving union handling logic to UnionTran [Spark Branch]

[Na Yang]

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Review request for hive, Brock Noland and Xuefu Zhang.


Bugs: HIVE-8141
    https://issues.apache.org/jira/browse/HIVE-8141


Repository: hive-git


Description
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Refactor the GraphTran code by moving union handling logic to UnionTran


Diffs
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  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/GraphTran.java 93674c1 
  ql/src/java/org/apache/hadoop/hive/ql/exec/spark/UnionTran.java 40f22a0 

Diff: https://reviews.apache.org/r/25720/diff/


Testing
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Thanks,

Na Yang