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The main motivation is to allow users to set the per-partition number of rows for manual incremental stats maintenance, as well as a means to 'drop' stats that may have caused undesirable plan changes. Change-Id: Iff38317a993e5d7952ea4df839947f5ec341e930 Reviewed-on: http://gerrit.ent.cloudera.com:8080/1010 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: jenkins