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