public static String formatExpression(final Expression expression) {
    return formatExpression(expression, FormatOptions.of(s -> false));
  }
@Test
  public void shouldFormatQualifiedColumnReference() {
    final QualifiedColumnReferenceExp ref = new QualifiedColumnReferenceExp(
        SourceName.of("foo"),
        ColumnName.of("bar")
    );
    assertThat(ExpressionFormatter.formatExpression(ref), equalTo("foo.bar"));
  }