@Override
      protected boolean canUseDirectSql(GetHelper<List<String>> ctx) throws MetaException {
        return directSql.generateSqlFilterForPushdown(catName, dbName, tblName,
            partitionKeys, tree, null, filter);
      }
Drop an MPartition and cascade deletes (e.g., delete partition privilege grants,
  drop the storage descriptor cleanly, etc.)
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java