public void TypeOfSequence()
        {
            var qmb = new QueryModelBuilder();
            qmb.AddClause(new SelectClause(Expression.Constant(1.0)));
            int[] list = new int[10];
            qmb.AddClause(new MainFromClause("r1", typeof(int), Expression.Constant(list)));

            var h = new QMFuncHeader() { Arguments = new object[] { }, IsSequence = true, QM = qmb.Build(), QMText = "hi" };
            var src = new QMFuncSource(h);
            Assert.AreEqual(typeof(double[]), src.ResultType, "result type");

            Assert.AreEqual(typeof(double[]), src.CacheVariable.Type, "Type of cache");
            Assert.AreEqual(typeof(bool), src.CacheVariableGood.Type, "Type of the cache good flag");
        }
        /// <summary>
        /// Generate a function with no arguments that returns an int given that name. The
        /// actual statement is a very simple constant.
        /// </summary>
        /// <param name="fname"></param>
        /// <returns></returns>
        public static QMFuncSource GenerateFunction()
        {
            int[] ints = new int[10];
            var qmb = new QueryModelBuilder();
            qmb.AddClause(new MainFromClause("i", typeof(int), Expression.Constant(ints)));
            qmb.AddClause(new SelectClause(Expression.Constant(1)));
            qmb.AddResultOperator(new Remotion.Linq.Clauses.ResultOperators.CountResultOperator());

            var h = new QMFuncHeader() { Arguments = new object[] { }, QM = qmb.Build() };
            h.QMText = h.QM.ToString();
            var f = new QMFuncSource(h);

            var p = DeclarableParameter.CreateDeclarableParameterExpression(typeof(int));
            var st = new StatementAssign(p, new ValSimple("5", typeof(int)));
            var inlineblock = new StatementInlineBlock();
            inlineblock.Add(st);
            inlineblock.Add(new StatementReturn(p));
            f.SetCodeBody(inlineblock);

            return f;
        }
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    /// <summary>
    /// Clones this <see cref="QueryModel"/>, returning a new <see cref="QueryModel"/> equivalent to this instance, but with its clauses being
    /// clones of this instance's clauses. Any <see cref="QuerySourceReferenceExpression"/> in the cloned clauses that points back to another clause 
    /// in  this <see cref="QueryModel"/> (including its subqueries) is adjusted to point to the respective clones in the cloned 
    /// <see cref="QueryModel"/>. Any subquery nested in the <see cref="QueryModel"/> is also cloned.
    /// </summary>
    /// <param name="querySourceMapping">The <see cref="QuerySourceMapping"/> defining how to adjust instances of 
    /// <see cref="QuerySourceReferenceExpression"/> in the cloned <see cref="QueryModel"/>. If there is a <see cref="QuerySourceReferenceExpression"/>
    /// that points out of the <see cref="QueryModel"/> being cloned, specify its replacement via this parameter. At the end of the cloning process,
    /// this object maps all the clauses in this original <see cref="QueryModel"/> to the clones created in the process.
    /// </param>
    public QueryModel Clone (QuerySourceMapping querySourceMapping)
    {
      ArgumentUtility.CheckNotNull ("querySourceMapping", querySourceMapping);

      var cloneContext = new CloneContext (querySourceMapping);
      var queryModelBuilder = new QueryModelBuilder();

      queryModelBuilder.AddClause (MainFromClause.Clone (cloneContext));
      foreach (var bodyClause in BodyClauses)
        queryModelBuilder.AddClause (bodyClause.Clone (cloneContext));
      queryModelBuilder.AddClause (SelectClause.Clone (cloneContext));

      foreach (var resultOperator in ResultOperators)
      {
        var resultOperatorClone = resultOperator.Clone (cloneContext);
        queryModelBuilder.AddResultOperator (resultOperatorClone);
      }

      var clone = queryModelBuilder.Build ();
      clone.TransformExpressions (ex => CloningExpressionTreeVisitor.AdjustExpressionAfterCloning (ex, cloneContext.QuerySourceMapping));
      clone.ResultTypeOverride = ResultTypeOverride;
      return clone;
    }