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 testIntegerLtEq() {
    boolean shouldRead =
        new InclusiveMetricsEvaluator(SCHEMA, lessThanOrEqual("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, lessThanOrEqual("id", INT_MIN_VALUE - 1)).eval(FILE);
    assertThat(shouldRead).as("Should not read: id range below lower bound (29 < 30)").isFalse();

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

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