private DryadQueryNode VisitAggregate(QueryNodeInfo source,
Expression seed,
LambdaExpression funcLambda,
LambdaExpression resultLambda,
bool isQuery,
Expression queryExpr)
{
DryadQueryNode child = this.Visit(source);
DryadQueryNode resNode = child;
if (HpcLinqExpression.IsAssociative(funcLambda))
{
LambdaExpression combinerLambda = HpcLinqExpression.GetAssociativeCombiner(funcLambda);
ResourceAttribute attrib = AttributeSystem.GetResourceAttrib(funcLambda);
bool funcIsExpensive = (attrib != null && attrib.IsExpensive);
resNode = this.PromoteConcat(
source, child,
delegate(DryadQueryNode x) {
DryadQueryNode y = new DryadAggregateNode("AssocAggregate", seed,
funcLambda, combinerLambda, resultLambda,
1, isQuery, queryExpr, x, false);
return new DryadAggregateNode("AssocTreeAggregate", seed,
funcLambda, combinerLambda, resultLambda,
2, isQuery, queryExpr, y, false);
});
resNode = new DryadAggregateNode("AssocAggregate", seed, funcLambda, combinerLambda, resultLambda,
3, isQuery, queryExpr, resNode, funcIsExpensive);
}
else
{
resNode = new DryadAggregateNode("Aggregate", seed, funcLambda, null, resultLambda, 3,
isQuery, queryExpr, child, false);
}
return resNode;
}
internal virtual string Visit(DryadAggregateNode node,
CodeMemberMethod vertexMethod,
string[] readerNames,
string[] writerNames)
{
return node.AddVertexCode(vertexMethod, readerNames, writerNames);
}