// Obtain those method and state factories for each level
private static AggregationLocalGroupByLevel GetLevel(
int levelNumber,
AggregationGroupByLocalGroupLevel level,
ExprEvaluator[] methodEvaluatorsAll,
AggregationMethodFactory[] methodFactoriesAll,
AggregationStateFactory[] stateFactoriesAll,
AggregationLocalGroupByColumn[] columns,
bool defaultLevel,
AggregationAccessorSlotPair[] accessors)
{
ExprNode[] partitionExpr = level.PartitionExpr;
ExprEvaluator[] partitionEvaluators = ExprNodeUtility.GetEvaluators(partitionExpr);
IList<ExprEvaluator> methodEvaluators = new List<ExprEvaluator>();
IList<AggregationMethodFactory> methodFactories = new List<AggregationMethodFactory>();
IList<AggregationStateFactory> stateFactories = new List<AggregationStateFactory>();
foreach (AggregationServiceAggExpressionDesc expr in level.Expressions)
{
int column = expr.ColumnNum.Value;
int methodOffset = -1;
bool methodAgg = true;
AggregationAccessorSlotPair pair = null;
if (column < methodEvaluatorsAll.Length)
{
methodEvaluators.Add(methodEvaluatorsAll[column]);
methodFactories.Add(methodFactoriesAll[column]);
methodOffset = methodFactories.Count - 1;
}
else
{
// slot gives us the number of the state factory
int absoluteSlot = accessors[column - methodEvaluatorsAll.Length].Slot;
AggregationAccessor accessor = accessors[column - methodEvaluatorsAll.Length].Accessor;
AggregationStateFactory factory = stateFactoriesAll[absoluteSlot];
int relativeSlot = stateFactories.IndexOf(factory);
if (relativeSlot == -1)
{
stateFactories.Add(factory);
relativeSlot = stateFactories.Count - 1;
}
methodAgg = false;
pair = new AggregationAccessorSlotPair(relativeSlot, accessor);
}
columns[column] = new AggregationLocalGroupByColumn(
defaultLevel, partitionEvaluators, methodOffset, methodAgg, pair, levelNumber);
}
return new AggregationLocalGroupByLevel(
methodEvaluators.ToArray(),
methodFactories.ToArray(),
stateFactories.ToArray(), partitionEvaluators, defaultLevel);
}
public static AggregationLocalGroupByPlan Analyze(
ExprEvaluator[] evaluators,
AggregationMethodFactory[] prototypes,
AggregationStateFactory[] accessAggregations,
AggregationGroupByLocalGroupDesc localGroupDesc,
ExprNode[] groupByExpressions,
AggregationAccessorSlotPair[] accessors)
{
if (groupByExpressions == null)
{
groupByExpressions = ExprNodeUtility.EMPTY_EXPR_ARRAY;
}
var columns = new AggregationLocalGroupByColumn[localGroupDesc.NumColumns];
IList<AggregationLocalGroupByLevel> levelsList = new List<AggregationLocalGroupByLevel>();
AggregationLocalGroupByLevel optionalTopLevel = null;
// determine optional top level (level number is -1)
for (int i = 0; i < localGroupDesc.Levels.Length; i++)
{
AggregationGroupByLocalGroupLevel levelDesc = localGroupDesc.Levels[i];
if (levelDesc.PartitionExpr.Length == 0)
{
optionalTopLevel = GetLevel(
-1, levelDesc, evaluators, prototypes, accessAggregations, columns,
groupByExpressions.Length == 0, accessors);
}
}
// determine default (same as group-by) level, if any, assign level number 0
int levelNumber = 0;
for (int i = 0; i < localGroupDesc.Levels.Length; i++)
{
AggregationGroupByLocalGroupLevel levelDesc = localGroupDesc.Levels[i];
if (levelDesc.PartitionExpr.Length == 0)
{
continue;
}
var isDefaultLevel = groupByExpressions != null && ExprNodeUtility.DeepEqualsIgnoreDupAndOrder(groupByExpressions, levelDesc.PartitionExpr);
if (isDefaultLevel)
{
AggregationLocalGroupByLevel level = GetLevel(
0, levelDesc, evaluators, prototypes, accessAggregations, columns, isDefaultLevel, accessors);
levelsList.Add(level);
levelNumber++;
break;
}
}
// determine all other levels, assign level numbers
for (int i = 0; i < localGroupDesc.Levels.Length; i++)
{
AggregationGroupByLocalGroupLevel levelDesc = localGroupDesc.Levels[i];
if (levelDesc.PartitionExpr.Length == 0)
{
continue;
}
bool isDefaultLevel = groupByExpressions != null &&
ExprNodeUtility.DeepEqualsIgnoreDupAndOrder(
groupByExpressions, levelDesc.PartitionExpr);
if (isDefaultLevel)
{
continue;
}
AggregationLocalGroupByLevel level = GetLevel(
levelNumber, levelDesc, evaluators, prototypes, accessAggregations, columns, isDefaultLevel,
accessors);
levelsList.Add(level);
levelNumber++;
}
// totals
int numMethods = 0;
int numAccesses = 0;
if (optionalTopLevel != null)
{
numMethods += optionalTopLevel.MethodFactories.Length;
numAccesses += optionalTopLevel.StateFactories.Length;
}
foreach (AggregationLocalGroupByLevel level in levelsList)
{
numMethods += level.MethodFactories.Length;
numAccesses += level.StateFactories.Length;
}
AggregationLocalGroupByLevel[] levels = levelsList.ToArray();
return new AggregationLocalGroupByPlan(numMethods, numAccesses, columns, optionalTopLevel, levels);
}