internal override void WrapPartitionedStream <TKey>(
            PartitionedStream <TInput, TKey> inputStream, IPartitionedStreamRecipient <TOutput> recipient, bool preferStriping, QuerySettings settings)
        {
            int partitionCount = inputStream.PartitionCount;

            // If the index is not correct, we need to reindex.
            PartitionedStream <TInput, int> inputStreamInt;

            if (_prematureMerge)
            {
                ListQueryResults <TInput> listResults = QueryOperator <TInput> .ExecuteAndCollectResults(
                    inputStream, partitionCount, Child.OutputOrdered, preferStriping, settings);

                inputStreamInt = listResults.GetPartitionedStream();
            }
            else
            {
                Debug.Assert(typeof(TKey) == typeof(int));
                inputStreamInt = (PartitionedStream <TInput, int>)(object) inputStream;
            }

            // Since the index is correct, the type of the index must be int
            PartitionedStream <TOutput, int> outputStream =
                new PartitionedStream <TOutput, int>(partitionCount, Util.GetDefaultComparer <int>(), OrdinalIndexState);

            for (int i = 0; i < partitionCount; i++)
            {
                outputStream[i] = new IndexedSelectQueryOperatorEnumerator(inputStreamInt[i], _selector);
            }

            recipient.Receive(outputStream);
        }
        internal override void WrapPartitionedStream <TKey>(PartitionedStream <TInput, TKey> inputStream, IPartitionedStreamRecipient <TOutput> recipient, bool preferStriping, QuerySettings settings)
        {
            PartitionedStream <TInput, int> stream;
            int partitionCount = inputStream.PartitionCount;

            if (this.m_prematureMerge)
            {
                stream = QueryOperator <TInput> .ExecuteAndCollectResults <TKey>(inputStream, partitionCount, base.Child.OutputOrdered, preferStriping, settings).GetPartitionedStream();
            }
            else
            {
                stream = (PartitionedStream <TInput, int>)inputStream;
            }
            PartitionedStream <TOutput, int> partitionedStream = new PartitionedStream <TOutput, int>(partitionCount, Util.GetDefaultComparer <int>(), this.OrdinalIndexState);

            for (int i = 0; i < partitionCount; i++)
            {
                partitionedStream[i] = new IndexedSelectQueryOperatorEnumerator <TInput, TOutput>(stream[i], this.m_selector);
            }
            recipient.Receive <int>(partitionedStream);
        }