public static IAcceptsOrderBy GroupBy(this IAcceptsGroupBy @this, params string[] termArgs)
 {
     @this.Accept(new GroupByClause(termArgs));
     return(@this);
 }
 public static IAcceptsOrderBy GroupBy(this IAcceptsGroupBy @this, IEnumerable <string> terms)
 {
     @this.Accept(new GroupByClause(terms));
     return(@this);
 }