private void MergeByComparison()
{
var left = dataLeft.Count > 0 ? dataLeft.Peek() : default;
var right = dataRight.Count > 0 ? dataRight.Peek() : default; ;
if (right == null)
CreateOutput(dataLeft.Dequeue(), right);
else if (left == null)
CreateOutput(left, dataRight.Dequeue());
else
{
int comp = ComparisonFunc.Invoke(left, right);
if (comp == 0)
CreateOutput(dataLeft.Dequeue(), dataRight.Dequeue());
else if (comp < 0)
CreateOutput(dataLeft.Dequeue(), default);
else if (comp > 0)
CreateOutput(default, dataRight.Dequeue());
