Avoid UnionStructObjectInspector for partition columns when necessary
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Key: HIVE-1752
URL: https://issues.apache.org/jira/browse/HIVE-1752
Project: Hive
Issue Type: Improvement
Reporter: Siying Dong
Assignee: Siying Dong
Once HIVE-1750 is finished, union struct for partition columns and normal
columns is not needed anymore. We can save some costs by not having the struct.
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