@Override
  public MaterializedWindowedTable windowed() {
    return new KsqlMaterializedWindowedTable(inner.windowed());
  }
@Test
  public void shouldFilterWindowed() {
    // Given:
    final MaterializedWindowedTable table = materialization.windowed();
    givenNoopProject();
    when(filter.apply(any(), any(), any())).thenReturn(Optional.empty());

    // When:
    final Iterator<WindowedRow> result =
        table.get(aKey, partition, windowStartBounds, windowEndBounds);

    // Then:
    assertThat(result.hasNext(), is(false));
  }