public override Exceptional<FuncParameter> Aggregate(IEnumerable<DBObjectStream> myDBObjects, TypeAttribute myTypeAttribute, DBContext myDBContext, params Functions.ParameterValue[] myParameters)
{
var aggregateResult = new DBDouble(0d);
var total = 0UL;
foreach (var dbo in myDBObjects)
{
var attr = dbo.GetAttribute(myTypeAttribute, myTypeAttribute.GetDBType(myDBContext.DBTypeManager), myDBContext);
if (attr.Failed())
{
return new Exceptional<FuncParameter>(attr);
}
if (attr.Value != null && attr.Value is ADBBaseObject && aggregateResult.IsValidValue((attr.Value as ADBBaseObject).Value))
{
aggregateResult.Add((attr.Value as ADBBaseObject));
total++;
}
else
{
return new Exceptional<FuncParameter>(new Error_AggregateIsNotValidOnThisAttribute(myTypeAttribute.Name));
}
}
aggregateResult.Div(new DBUInt64(total));
return new Exceptional<FuncParameter>(new FuncParameter(aggregateResult));
}
public override Exceptional<FuncParameter> Aggregate(AAttributeIndex attributeIndex, GraphDBType graphDBType, DBContext dbContext)
{
if (attributeIndex.IsUUIDIndex)
{
return new Exceptional<FuncParameter>(new Error_NotImplemented(new System.Diagnostics.StackTrace(true), "AVG(UUID) is not implemented!"));
}
var indexRelatedType = dbContext.DBTypeManager.GetTypeByUUID(attributeIndex.IndexRelatedTypeUUID);
// HACK: rewrite as soon as we have real attribute index keys
ADBBaseObject aADBBaseObject = new DBDouble(DBObjectInitializeType.Default);
DBUInt64 total = new DBUInt64((UInt64)0);
foreach (var idxEntry in attributeIndex.GetKeyValues(indexRelatedType, dbContext))
{
aADBBaseObject.Add(aADBBaseObject.Clone(idxEntry.Key));
total += (UInt64)idxEntry.Value.LongCount();
}
aADBBaseObject.Div(total);
return new Exceptional<FuncParameter>(new FuncParameter(aADBBaseObject));
}