public override void SetUp()
        {
            base.SetUp();

            _stageMock = MockRepository.GenerateMock <ISqlPreparationStage> ();
            _handler   = new UnionResultOperatorHandler();

            var selectProjection = ExpressionHelper.CreateExpression(typeof(int));

            _sqlStatementBuilder = new SqlStatementBuilder
            {
                DataInfo         = new StreamedSequenceInfo(typeof(int[]), selectProjection),
                SelectProjection = selectProjection
            };
            _context = SqlStatementModelObjectMother.CreateSqlPreparationContext();
        }