Update transident_lastDdlTime only if not specified
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Key: HIVE-1768
URL: https://issues.apache.org/jira/browse/HIVE-1768
Project: Hive
Issue Type: Improvement
Components: Metastore
Affects Versions: 0.7.0
Reporter: Paul Yang
Assignee: Paul Yang
Currently, whenever a table/partition is created/altered, the field
'transient_lastDdl' time is updated with the current timestamp. For normal
operations, this is the desired behavior. However for some housekeeping tasks,
it may be helpful if the user could keep the existing value (or set it to
something different).
One example where this is useful is if a partition is copied between clusters.
If the last modified time were kept same after the initial copy, it would be
easy to know if one partition were overwritten/updated by comparing timestamps.
This patch alters the behavior of create/alter methods in the metastore API to
update the timestamp only if it is not specified in the object.
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