code: /** 
   * Tests the SubSliceQuery, a query on columns within a supercolumn
   */
  @Test public void testSubSliceQuery(){
    String cf="Super1";
    TestCleanupDescriptor cleanup=insertSuperColumns(cf,1,"testSliceQueryOnSubcolumns",1,"testSliceQueryOnSubcolumns_column");
    SubSliceQuery<String,String,String,String> q=createSubSliceQuery(ko,se,se,se,se);
    q.setColumnFamily(cf);
    q.setSuperColumn("testSliceQueryOnSubcolumns_column0");
    q.setKey("testSliceQueryOnSubcolumns0");
    q.setColumnNames("c000","c110","c_doesn't_exist");
    QueryResult<ColumnSlice<String,String>> r=q.execute();
    assertNotNull(r);
    ColumnSlice<String,String> slice=r.get();
    assertNotNull(slice);
    assertEquals(2,slice.getColumns().size());
    assertEquals("v000",slice.getColumnByName("c000").getValue());
    q=createSubSliceQuery(ko,se,se,se,se);
    q.setColumnFamily(cf);
    q.setKey("testSliceQueryOnSubcolumns0");
    q.setSuperColumn("testSliceQueryOnSubcolumns_column0");
    q.setRange("c000","c110",false,2);
    r=q.execute();
    assertNotNull(r);
    slice=r.get();
    assertNotNull(slice);
    for (  HColumn<String,String> column : slice.getColumns()) {
      if (!column.getName().equals("c000") && !column.getName().equals("c110")) {
        fail("A columns with unexpected column name returned: " + column.getName());
      }
    }
    deleteColumns(cleanup);
    r=q.execute();
    assertNotNull(r);
    slice=r.get();
    assertNotNull(slice);
    assertTrue(slice.getColumns().isEmpty());
  }
  