// <summary>
// Common copy path for all SetOps
// </summary>
// <param name="op"> The SetOp to Copy (must be one of ExceptOp, IntersectOp, UnionAllOp) </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>
private Node CopySetOp(SetOp op, Node n)
{
// Visit the Node's children and map their Vars
var children = ProcessChildren(n);
var leftMap = new VarMap();
var rightMap = new VarMap();
foreach (var kv in op.VarMap[0])
{
// Create a new output Var that is a copy of the original output Var
Var outputVar = m_destCmd.CreateSetOpVar(kv.Key.Type);
// Add a mapping for the new output var we've just created
SetMappedVar(kv.Key, outputVar);
// Add this output var's entries to the new VarMaps
leftMap.Add(outputVar, GetMappedVar(kv.Value));
rightMap.Add(outputVar, GetMappedVar((op.VarMap[1])[kv.Key]));
}
SetOp newSetOp = null;
switch (op.OpType)
{
case OpType.UnionAll:
{
var branchDiscriminator = ((UnionAllOp)op).BranchDiscriminator;
if (null != branchDiscriminator)
{
branchDiscriminator = GetMappedVar(branchDiscriminator);
}
newSetOp = m_destCmd.CreateUnionAllOp(leftMap, rightMap, branchDiscriminator);
}
break;
case OpType.Intersect:
{
newSetOp = m_destCmd.CreateIntersectOp(leftMap, rightMap);
}
break;
case OpType.Except:
{
newSetOp = m_destCmd.CreateExceptOp(leftMap, rightMap);
}
break;
default:
{
Debug.Assert(false, "Unexpected SetOpType");
}
break;
}
return(m_destCmd.CreateNode(newSetOp, children));
}
internal virtual void BuildUnionAllLadder(
IList <Node> inputNodes,
IList <Var> inputVars,
out Node resultNode,
out IList <Var> resultVars)
{
if (inputNodes.Count == 0)
{
resultNode = (Node)null;
resultVars = (IList <Var>)null;
}
else
{
int num = inputVars.Count / inputNodes.Count;
if (inputNodes.Count == 1)
{
resultNode = inputNodes[0];
resultVars = inputVars;
}
else
{
List <Var> varList1 = new List <Var>();
Node node = inputNodes[0];
for (int index = 0; index < num; ++index)
{
varList1.Add(inputVars[index]);
}
for (int index1 = 1; index1 < inputNodes.Count; ++index1)
{
VarMap leftMap = new VarMap();
VarMap rightMap = new VarMap();
List <Var> varList2 = new List <Var>();
for (int index2 = 0; index2 < num; ++index2)
{
SetOpVar setOpVar = this.CreateSetOpVar(varList1[index2].Type);
varList2.Add((Var)setOpVar);
leftMap.Add((Var)setOpVar, varList1[index2]);
rightMap.Add((Var)setOpVar, inputVars[index1 * num + index2]);
}
node = this.CreateNode((Op)this.CreateUnionAllOp(leftMap, rightMap), node, inputNodes[index1]);
varList1 = varList2;
}
resultNode = node;
resultVars = (IList <Var>)varList1;
}
}
}
private Node CopySetOp(SetOp op, Node n)
{
List <Node> args = this.ProcessChildren(n);
VarMap leftMap = new VarMap();
VarMap rightMap = new VarMap();
foreach (KeyValuePair <Var, Var> keyValuePair in (Dictionary <Var, Var>)op.VarMap[0])
{
Var setOpVar = (Var)this.m_destCmd.CreateSetOpVar(keyValuePair.Key.Type);
this.SetMappedVar(keyValuePair.Key, setOpVar);
leftMap.Add(setOpVar, this.GetMappedVar(keyValuePair.Value));
rightMap.Add(setOpVar, this.GetMappedVar(op.VarMap[1][keyValuePair.Key]));
}
SetOp setOp = (SetOp)null;
switch (op.OpType)
{
case OpType.UnionAll:
Var var = ((UnionAllOp)op).BranchDiscriminator;
if (var != null)
{
var = this.GetMappedVar(var);
}
setOp = (SetOp)this.m_destCmd.CreateUnionAllOp(leftMap, rightMap, var);
break;
case OpType.Intersect:
setOp = (SetOp)this.m_destCmd.CreateIntersectOp(leftMap, rightMap);
break;
case OpType.Except:
setOp = (SetOp)this.m_destCmd.CreateExceptOp(leftMap, rightMap);
break;
}
return(this.m_destCmd.CreateNode((Op)setOp, args));
}
// <summary>
// Set the "cloned" var for a given Var
// WARNING: If a mapping already exists, an exception is raised
// </summary>
// <param name="v"> The original Var </param>
// <param name="mappedVar"> The cloned Var </param>
private void SetMappedVar(Var v, Var mappedVar)
{
m_varMap.Add(v, mappedVar);
}