@Override
      protected List<Void> getJdoResult(GetHelper<List<Void>> ctx) throws MetaException {
        dropPartitionsViaJdo(catName, dbName, tblName, partNames);
        return Collections.emptyList();
      }
Convert a Partition object into an MPartition, which is an object backed by the db
If the Partition's set of columns is the same as the parent table's AND useTableCD
is true, then this partition's storage descriptor's column descriptor will point
to the same one as the table's storage descriptor.
@param part the partition to convert
@param mt the parent table object
@return the model partition object, and null if the input partition is null.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java