@SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "lookupConstraints is ImmutableList")
  public List<LookupConstraint> getLookupConstraints() {
    return lookupConstraints;
  }
@Test
  public void shouldExtractKeyFromNonEqualComparison() {
    // Given:
    final Expression expression = new ComparisonExpression(
        Type.GREATER_THAN,
        new UnqualifiedColumnReferenceExp(ColumnName.of("K")),
        new IntegerLiteral(1)
    );

    final QueryFilterNode filterNode = new QueryFilterNode(
      NODE_ID,
      source,
      expression,
      metaStore,
      ksqlConfig,
      false,
      plannerOptions
    );

    // When:
    final List<LookupConstraint> keys = filterNode.getLookupConstraints();

    // Then:
    assertThat(keys.size(), is(1));
    assertThat(keys.get(0), is(instanceOf(NonKeyConstraint.class)));
  }