Github user blrunner commented on the pull request:
https://github.com/apache/tajo/pull/618#issuecomment-121437463
Catalog check the identity of partition using the name of partition instead
of location. In above case, the name of partition is
``n_regionkey=1,n_nationkey=2``. If you didn't execute ``alter table drop
partition statement``, the partition of (n_regionkey=1,n_nationkey=2) exists on
catalog. Could you execute ``alter table add partition statement`` after
executing ``alter table drop partition statement``?
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