add support for insert partition overwrite(...) if not exists
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Key: HIVE-2602
URL: https://issues.apache.org/jira/browse/HIVE-2602
Project: Hive
Issue Type: New Feature
Reporter: Namit Jain
INSERT OVERWRITE TABLE X PARTITION (a=b, c=d) IF NOT EXISTS ...
The partition should be created and written if and only if it's not there
already.
The support can be added for dynamic partitions in the future, but this jira is
for adding this support for static partitions.
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