ALTER TABLE ADD PARTITION needs IF NOT EXISTS.
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                 Key: HIVE-2826
                 URL: https://issues.apache.org/jira/browse/HIVE-2826
             Project: Hive
          Issue Type: Improvement
            Reporter: Adam Kramer


When trying to add a partition, if the partition already exists, we shouldn't 
necessarily cause the job to fail...just like we have CREATE TABLE IF NOT 
EXISTS and DROP TABLE IF EXISTS, we should have ALTER TABLE foo ADD PARTITION 
IF NOT EXISTS (ds=whatever).

Ditto for ALTER VIEW.

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