do not update transient_lastDdlTime if the partition is modified by a
housekeeping operation
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Key: HIVE-1394
URL: https://issues.apache.org/jira/browse/HIVE-1394
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Namit Jain
Assignee: Paul Yang
Currently. purging looks at the hdfs time to see the last time the files got
modified.
It should look at the metastore property instead - these are facebook specific
utilities, which do not require any changes to hive.
However, in some cases, the operation might be performed by some housekeeping
job, which should not modify the timestamp.
Since, hive has no way of knowing the origin of the query, it might be a good
idea to add a new hint which specifies that the
operation is a cleanup operation, and the timestamp in the metastore need not
be touched for that scenario.
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