public boolean eval(ContentFile<?> file) {
    // TODO: detect the case where a column is missing from the file using file's max field id.
    return new MetricsEvalVisitor().eval(file);
  }
@Test
  public void testIntegerLt() {
    boolean shouldRead =
        new InclusiveMetricsEvaluator(SCHEMA, lessThan("id", INT_MIN_VALUE - 25)).eval(FILE);
    assertThat(shouldRead).as("Should not read: id range below lower bound (5 < 30)").isFalse();

    shouldRead = new InclusiveMetricsEvaluator(SCHEMA, lessThan("id", INT_MIN_VALUE)).eval(FILE);
    assertThat(shouldRead)
        .as("Should not read: id range below lower bound (30 is not < 30)")
        .isFalse();

    shouldRead =
        new InclusiveMetricsEvaluator(SCHEMA, lessThan("id", INT_MIN_VALUE + 1)).eval(FILE);
    assertThat(shouldRead).as("Should read: one possible id").isTrue();

    shouldRead = new InclusiveMetricsEvaluator(SCHEMA, lessThan("id", INT_MAX_VALUE)).eval(FILE);
    assertThat(shouldRead).as("Should read: may possible ids").isTrue();
  }