public boolean eval(StructLike data) {
    return new EvalVisitor().eval(data);
  }
@Test
  public void testAlwaysFalse() {
    Evaluator evaluator = new Evaluator(STRUCT, alwaysFalse());
    assertThat(evaluator.eval(TestHelpers.Row.of())).as("always false").isFalse();
  }