Xintong Bian created HIVE-16397:
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Summary: alter table concatenate should check the state of folder
before replacing it
Key: HIVE-16397
URL: https://issues.apache.org/jira/browse/HIVE-16397
Project: Hive
Issue Type: Improvement
Reporter: Xintong Bian
alter table concatenate command will remove all files containing in a directory
after the success of the merge job, while in an external table, new data can
arrive after the launch of the merge job, but they are also deleted in the
replacing phase.
We should check the last modified time of the directory, in case it is modified
after the launch of merge job, abort the replace
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