public override void Visit(FunctionOp op, Node n)
        {
            VisitDefault(n);
            if (!PlanCompilerUtil.IsCollectionAggregateFunction(op, n))
            {
                return;
            }

            if (n.Children.Count > 1)
            {
                return;
            }

            GroupAggregateVarInfo referencedGroupAggregateVarInfo;
            Node templateNode;
            bool isUnnested;

            if (GroupAggregateVarComputationTranslator.TryTranslateOverGroupAggregateVar(
                    n.Child0, false, _command, _groupAggregateVarInfoManager, out referencedGroupAggregateVarInfo, out templateNode,
                    out isUnnested)
                &&
                (isUnnested || AggregatePushdownUtil.IsVarRefOverGivenVar(templateNode, referencedGroupAggregateVarInfo.GroupAggregateVar)))
            {
                referencedGroupAggregateVarInfo.CandidateAggregateNodes.Add(new KeyValuePair <Node, List <Node> >(n, new List <Node> {
                    templateNode
                }));
            }
        }
Beispiel #2
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        public static bool TryTranslateOverGroupAggregateVar(
            System.Data.Entity.Core.Query.InternalTrees.Node subtree,
            bool isVarDefinition,
            Command command,
            GroupAggregateVarInfoManager groupAggregateVarInfoManager,
            out GroupAggregateVarInfo groupAggregateVarInfo,
            out System.Data.Entity.Core.Query.InternalTrees.Node templateNode,
            out bool isUnnested)
        {
            GroupAggregateVarComputationTranslator computationTranslator = new GroupAggregateVarComputationTranslator(command, groupAggregateVarInfoManager);

            System.Data.Entity.Core.Query.InternalTrees.Node n = subtree;
            SoftCastOp softCastOp1 = (SoftCastOp)null;

            if (n.Op.OpType == OpType.SoftCast)
            {
                softCastOp1 = (SoftCastOp)n.Op;
                n           = n.Child0;
            }
            bool flag;

            if (n.Op.OpType == OpType.Collect)
            {
                templateNode = computationTranslator.VisitCollect(n);
                flag         = true;
            }
            else
            {
                templateNode = computationTranslator.VisitNode(n);
                flag         = false;
            }
            groupAggregateVarInfo = computationTranslator._targetGroupAggregateVarInfo;
            isUnnested            = computationTranslator._isUnnested;
            if (computationTranslator._targetGroupAggregateVarInfo == null || templateNode == null)
            {
                return(false);
            }
            if (softCastOp1 != null)
            {
                SoftCastOp softCastOp2 = flag || !isVarDefinition && AggregatePushdownUtil.IsVarRefOverGivenVar(templateNode, computationTranslator._targetGroupAggregateVarInfo.GroupAggregateVar) ? command.CreateSoftCastOp(TypeHelpers.GetEdmType <CollectionType>(softCastOp1.Type).TypeUsage) : softCastOp1;
                templateNode = command.CreateNode((Op)softCastOp2, templateNode);
            }
            return(true);
        }
Beispiel #3
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        public override void Visit(FunctionOp op, Node n)
        {
            VisitDefault(n);
            if (!PlanCompilerUtil.IsCollectionAggregateFunction(op, n))
            {
                return;
            }
            PlanCompiler.Assert(n.Children.Count == 1, "Aggregate Function must have one argument");

            var argumentNode = n.Child0;

            GroupAggregateVarInfo referencedGroupAggregateVarInfo;
            Node templateNode;
            bool isUnnested;

            if (GroupAggregateVarComputationTranslator.TryTranslateOverGroupAggregateVar(
                    n.Child0, false, _command, _groupAggregateVarInfoManager, out referencedGroupAggregateVarInfo, out templateNode,
                    out isUnnested)
                &&
                (isUnnested || AggregatePushdownUtil.IsVarRefOverGivenVar(templateNode, referencedGroupAggregateVarInfo.GroupAggregateVar)))
            {
                referencedGroupAggregateVarInfo.CandidateAggregateNodes.Add(new KeyValuePair <Node, Node>(n, templateNode));
            }
        }
        // <summary>
        // Try to produce an equivalent tree to the input subtree, over a single group aggregate variable.
        // Such translation can only be produced if all external references of the input subtree are to a
        // single group aggregate var, or to vars that are can be translated over that single group
        // aggregate var
        // </summary>
        // <param name="subtree"> The input subtree </param>
        // <param name="groupAggregateVarInfo"> The groupAggregateVarInfo over which the input subtree can be translated </param>
        // <param name="templateNode"> A tree that is equvalent to the input tree, but over the group aggregate variable represented by the groupAggregetVarInfo </param>
        // <returns> True, if the translation can be done, false otherwise </returns>
        public static bool TryTranslateOverGroupAggregateVar(
            Node subtree,
            bool isVarDefinition,
            Command command,
            GroupAggregateVarInfoManager groupAggregateVarInfoManager,
            out GroupAggregateVarInfo groupAggregateVarInfo,
            out Node templateNode,
            out bool isUnnested)
        {
            var handler = new GroupAggregateVarComputationTranslator(command, groupAggregateVarInfoManager);

            var        inputNode  = subtree;
            SoftCastOp softCastOp = null;
            bool       isCollect;

            if (inputNode.Op.OpType
                == OpType.SoftCast)
            {
                softCastOp = (SoftCastOp)inputNode.Op;
                inputNode  = inputNode.Child0;
            }

            if (inputNode.Op.OpType
                == OpType.Collect)
            {
                templateNode = handler.VisitCollect(inputNode);
                isCollect    = true;
            }
            else
            {
                templateNode = handler.VisitNode(inputNode);
                isCollect    = false;
            }

            groupAggregateVarInfo = handler._targetGroupAggregateVarInfo;
            isUnnested            = handler._isUnnested;

            if (handler._targetGroupAggregateVarInfo == null ||
                templateNode == null)
            {
                return(false);
            }
            if (softCastOp != null)
            {
                SoftCastOp newSoftCastOp;
                //
                // The type needs to be fixed only if the unnesting happened during this translation.
                // That can be recognized by these two cases:
                //      1) if the input node was a collect, or
                //      2) if the input did not represent a var definition, but a function aggregate argument and
                //              the template is VarRef of a group aggregate var.
                //
                if (isCollect
                    ||
                    !isVarDefinition &&
                    AggregatePushdownUtil.IsVarRefOverGivenVar(templateNode, handler._targetGroupAggregateVarInfo.GroupAggregateVar))
                {
                    newSoftCastOp = command.CreateSoftCastOp(TypeHelpers.GetEdmType <CollectionType>(softCastOp.Type).TypeUsage);
                }
                else
                {
                    newSoftCastOp = softCastOp;
                }
                templateNode = command.CreateNode(newSoftCastOp, templateNode);
            }
            return(true);
        }
Beispiel #5
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        public override void Visit(FunctionOp op, System.Data.Entity.Core.Query.InternalTrees.Node n)
        {
            this.VisitDefault(n);
            if (!PlanCompilerUtil.IsCollectionAggregateFunction(op, n))
            {
                return;
            }
            System.Data.Entity.Core.Query.PlanCompiler.PlanCompiler.Assert(n.Children.Count == 1, "Aggregate Function must have one argument");
            System.Data.Entity.Core.Query.InternalTrees.Node child0 = n.Child0;
            GroupAggregateVarInfo groupAggregateVarInfo;

            System.Data.Entity.Core.Query.InternalTrees.Node templateNode;
            bool isUnnested;

            if (!GroupAggregateVarComputationTranslator.TryTranslateOverGroupAggregateVar(n.Child0, false, this._command, this._groupAggregateVarInfoManager, out groupAggregateVarInfo, out templateNode, out isUnnested) || !isUnnested && !AggregatePushdownUtil.IsVarRefOverGivenVar(templateNode, groupAggregateVarInfo.GroupAggregateVar))
            {
                return;
            }
            groupAggregateVarInfo.CandidateAggregateNodes.Add(new KeyValuePair <System.Data.Entity.Core.Query.InternalTrees.Node, System.Data.Entity.Core.Query.InternalTrees.Node>(n, templateNode));
        }