private static void AddEquivalent(
ExprAggregateNode aggNodeToAdd,
IList<AggregationServiceAggExpressionDesc> equivalencyList)
{
// Check any same aggregation nodes among all aggregation clauses
bool foundEquivalent = false;
foreach (AggregationServiceAggExpressionDesc existing in equivalencyList)
{
ExprAggregateNode aggNode = existing.AggregationNode;
// we have equivalence when:
// (a) equals on node returns true
// (b) positional parameters are the same
// (c) non-positional (group-by over, if present, are the same ignoring duplicates)
if (!aggNode.EqualsNode(aggNodeToAdd, false))
{
continue;
}
if (!ExprNodeUtility.DeepEquals(aggNode.PositionalParams, aggNodeToAdd.PositionalParams, false))
{
continue;
}
if (aggNode.OptionalLocalGroupBy != null || aggNodeToAdd.OptionalLocalGroupBy != null)
{
if ((aggNode.OptionalLocalGroupBy == null && aggNodeToAdd.OptionalLocalGroupBy != null) ||
(aggNode.OptionalLocalGroupBy != null && aggNodeToAdd.OptionalLocalGroupBy == null))
{
continue;
}
if (
!ExprNodeUtility.DeepEqualsIgnoreDupAndOrder(
aggNode.OptionalLocalGroupBy.PartitionExpressions,
aggNodeToAdd.OptionalLocalGroupBy.PartitionExpressions))
{
continue;
}
}
existing.AddEquivalent(aggNodeToAdd);
foundEquivalent = true;
break;
}
if (!foundEquivalent)
{
equivalencyList.Add(new AggregationServiceAggExpressionDesc(aggNodeToAdd, aggNodeToAdd.Factory));
}
}
