// <summary>
// Copies a sort node
// </summary>
// <param name="op"> The Op to Copy </param>
// <param name="n"> The Node that references the Op </param>
// <returns> A copy of the original Node that references a copy of the original Op </returns>
public override Node Visit(SortOp op, Node n)
{
// Visit the Node's children and map their Vars
var children = ProcessChildren(n);
// Copy the SortOp's SortKeys
var newSortKeys = Copy(op.Keys);
// Create a new SortOp that uses the copied SortKeys
var newSortOp = m_destCmd.CreateSortOp(newSortKeys);
// Return a new Node that references the copied SortOp and has the copied child Nodes as its children
return(m_destCmd.CreateNode(newSortOp, children));
}