function testDiffCalculation_ExplicitColumns() {
  var table = schema.table('tableA');
  var builder = new lf.query.SelectBuilder(
      lf.Global.get(), [table['id'], table['name']]);
  builder.from(table);
  var query = builder.getQuery();
  checkDiffCalculation(query, 'ExplicitColumns');
}
Tests the case where the observed query explicitly names the columns to be
projected.