@Test
  public void testListPartitionSpecsByFilterNullFilter() throws Exception {
    List<List<String>> values = createTable4PartColsParts(client).testValues;
    PartitionSpecProxy pproxy = client.listPartitionSpecsByFilter(DB_NAME, TABLE_NAME, null, -1);
    assertPartitionsSpecProxy(pproxy, values);
  }
Testing listPartitionSpecsByFilter(String,String,String,int) ->
        get_part_specs_by_filter(String,String,String,int).
standalone-metastore/metastore-server/src/test/java/org/apache/hadoop/hive/metastore/client/TestListPartitions.java