// <summary>
// Clone an UnnestOp
// </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(UnnestOp op, Node n)
{
// Visit the Node's children and map their Vars
var children = ProcessChildren(n);
// Get the mapped unnest-var
var mappedVar = GetMappedVar(op.Var);
// Create a new unnestOp
var newTable = m_destCmd.CreateTableInstance(op.Table.TableMetadata);
var newUnnest = m_destCmd.CreateUnnestOp(mappedVar, newTable);
// Map the corresponding tables/columns
MapTable(newUnnest.Table, op.Table);
// create the unnest node
return(m_destCmd.CreateNode(newUnnest, children));
}