/// <summary>
/// DistinctOp
///
/// We remove all null and constant keys that are not referenced as long as
/// there is one key left. We add all remaining keys to the referenced list
/// and proceed to the inputs
/// </summary>
/// <param name="op">the DistinctOp</param>
/// <param name="n">Current subtree</param>
/// <returns></returns>
public override Node Visit(DistinctOp op, Node n)
{
if (op.Keys.Count > 1 && n.Child0.Op.OpType == OpType.Project)
{
RemoveRedundantConstantKeys(op.Keys, ((ProjectOp)n.Child0.Op).Outputs, n.Child0.Child1);
}
AddReference(op.Keys); // mark all keys as referenced - nothing more to do
VisitChildren(n); // visit the children
return(n);
}
/// <summary>
/// DistinctOp handling
///
/// Require all properties out of all structured vars
/// </summary>
/// <param name="op"></param>
/// <param name="n"></param>
public override void Visit(DistinctOp op, Node n)
{
foreach (Var v in op.Keys)
{
if (TypeUtils.IsStructuredType(v.Type))
{
AddPropertyRefs(v, PropertyRefList.All);
}
}
VisitChildren(n);
}
public override void Visit(DistinctOp op, System.Data.Entity.Core.Query.InternalTrees.Node n)
{
foreach (Var key in op.Keys)
{
if (TypeUtils.IsStructuredType(key.Type))
{
this.AddPropertyRefs(key, PropertyRefList.All);
}
}
this.VisitChildren(n);
}
public override System.Data.Entity.Core.Query.InternalTrees.Node Visit(
DistinctOp op,
System.Data.Entity.Core.Query.InternalTrees.Node n)
{
if (op.Keys.Count > 1 && n.Child0.Op.OpType == OpType.Project)
{
this.RemoveRedundantConstantKeys(op.Keys, ((ProjectOp)n.Child0.Op).Outputs, n.Child0.Child1);
}
this.AddReference((IEnumerable <Var>)op.Keys);
this.VisitChildren(n);
return(n);
}
private static bool ProcessDistinctOpOfKeys(
RuleProcessingContext context,
Node n,
out Node newNode)
{
Command command = context.Command;
ExtendedNodeInfo extendedNodeInfo = command.GetExtendedNodeInfo(n.Child0);
DistinctOp op = (DistinctOp)n.Op;
if (!extendedNodeInfo.Keys.NoKeys && op.Keys.Subsumes(extendedNodeInfo.Keys.KeyVars))
{
ProjectOp projectOp = command.CreateProjectOp(op.Keys);
VarDefListOp varDefListOp = command.CreateVarDefListOp();
Node node = command.CreateNode((Op)varDefListOp);
newNode = command.CreateNode((Op)projectOp, n.Child0, node);
return(true);
}
newNode = n;
return(false);
}
// <summary>
// DistinctOp
// </summary>
// <remarks>
// The input to a DistinctOp cannot be a NestOp – that would imply that
// we support distinctness over collections - which we don’t.
// </remarks>
public override Node Visit(DistinctOp op, Node n)
{
return NestingNotSupported(op, n);
}
/// <summary>
/// Simply flatten out every var in the keys, and return a new DistinctOp
/// </summary>
/// <param name="op"> DistinctOp </param>
/// <param name="n"> Current subtree </param>
/// <returns> </returns>
public override Node Visit(DistinctOp op, Node n)
{
VisitChildren(n);
// Simply flatten out all the Vars
var newKeys = FlattenVarSet(op.Keys);
n.Op = m_command.CreateDistinctOp(newKeys);
return n;
}
public override void Visit(DistinctOp op, Node n)
{
VisitRelOpDefault(op, n);
AssertRelOp(n.Child0.Op);
}
/// <summary>
/// Visitor pattern method for DistinctOp
/// </summary>
/// <param name="op"> The DistinctOp being visited </param>
/// <param name="n"> The Node that references the Op </param>
public virtual void Visit(DistinctOp op, Node n)
{
VisitRelOpDefault(op, n);
}
/// <summary>
/// DistinctOp handling
///
/// Require all properties out of all structured vars
/// </summary>
/// <param name="op"> </param>
/// <param name="n"> </param>
public override void Visit(DistinctOp op, Node n)
{
foreach (var v in op.Keys)
{
if (TypeUtils.IsStructuredType(v.Type))
{
AddPropertyRefs(v, PropertyRefList.All);
}
}
VisitChildren(n);
}
// <summary>
// Distinct
// </summary>
public override int Visit(DistinctOp op, Node n)
{
return(op.Keys.Count);
}
public override int Visit(DistinctOp op, System.Data.Entity.Core.Query.InternalTrees.Node n)
{
return(op.Keys.Count);
}
public override void Visit(DistinctOp op, Node n)
{
VisitRelOpDefault(op, n);
Map(op.Keys);
}
// <summary>
// Copies a DistinctOp
// </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(DistinctOp op, Node n)
{
// Visit the Node's children and map their Vars
var children = ProcessChildren(n);
// Copy the DistinctOp's Keys
var newDistinctKeys = Copy(op.Keys);
// Create a new DistinctOp that uses the copied keys
var newDistinctOp = m_destCmd.CreateDistinctOp(newDistinctKeys);
// Return a new Node that references the copied DistinctOp and has the copied child Nodes as its children
return m_destCmd.CreateNode(newDistinctOp, children);
}
public override void Visit(DistinctOp op, Node n)
{
VisitRelOpDefault(op, n);
Map(op.Keys);
}
public override void Visit(DistinctOp op, System.Data.Entity.Core.Query.InternalTrees.Node n)
{
this.VisitRelOpDefault((RelOp)op, n);
this.Map(op.Keys);
}