private static AggregationServiceForgeDesc[] PlanAggregations(
IList<ExprAggregateNode> measureAggregateExprNodes,
StreamTypeService compositeTypeServiceMeasure,
string[] allStreamNames,
EventType[] allTypes,
IOrderedDictionary<int, string> streamVariables,
ISet<string> variablesMultiple,
StatementBaseInfo @base,
StatementCompileTimeServices services)
{
IDictionary<int, IList<ExprAggregateNode>> measureExprAggNodesPerStream =
new Dictionary<int, IList<ExprAggregateNode>>();
foreach (var aggregateNode in measureAggregateExprNodes) {
// validate node and params
var count = 0;
var visitor = new ExprNodeIdentifierVisitor(true);
var isIStreamOnly = new bool[allStreamNames.Length];
var typeServiceAggregateMeasure = new StreamTypeServiceImpl(
allTypes,
allStreamNames,
isIStreamOnly,
false,
true);
var validationContext =
new ExprValidationContextBuilder(typeServiceAggregateMeasure, @base.StatementRawInfo, services)
.WithAllowBindingConsumption(true)
.Build();
aggregateNode.ValidatePositionals(validationContext);
if (aggregateNode.OptionalLocalGroupBy != null) {
throw new ExprValidationException(
"Match-recognize does not allow aggregation functions to specify a group-by");
}
foreach (var child in aggregateNode.ChildNodes) {
var validated = ExprNodeUtilityValidate.GetValidatedSubtree(
ExprNodeOrigin.MATCHRECOGMEASURE,
child,
validationContext);
validated.Accept(visitor);
aggregateNode.SetChildNode(count++, new ExprNodeValidated(validated));
}
// verify properties used within the aggregation
ISet<int> aggregatedStreams = new HashSet<int>();
foreach (var pair in visitor.ExprProperties) {
aggregatedStreams.Add(pair.First);
}
int? multipleVarStream = null;
foreach (var streamNumAggregated in aggregatedStreams) {
var variable = streamVariables.Get(streamNumAggregated);
if (variablesMultiple.Contains(variable)) {
if (multipleVarStream == null) {
multipleVarStream = streamNumAggregated;
continue;
}
throw new ExprValidationException(
"Aggregation functions in the measure-clause must only refer to properties of exactly one group variable returning multiple events");
}
}
if (multipleVarStream == null) {
throw new ExprValidationException(
"Aggregation functions in the measure-clause must refer to one or more properties of exactly one group variable returning multiple events");
}
var aggNodesForStream = measureExprAggNodesPerStream.Get(multipleVarStream.Value);
if (aggNodesForStream == null) {
aggNodesForStream = new List<ExprAggregateNode>();
measureExprAggNodesPerStream.Put(multipleVarStream.Value, aggNodesForStream);
}
aggNodesForStream.Add(aggregateNode);
}
// validate aggregation itself
foreach (var entry in measureExprAggNodesPerStream) {
foreach (var aggregateNode in entry.Value) {
var validationContext = new ExprValidationContextBuilder(
compositeTypeServiceMeasure,
@base.StatementRawInfo,
services)
.WithAllowBindingConsumption(true)
.WithMemberName(new ExprValidationMemberNameQualifiedRowRecogAgg(entry.Key))
.Build();
aggregateNode.Validate(validationContext);
}
}
// get aggregation service per variable
var aggServices = new AggregationServiceForgeDesc[allStreamNames.Length];
var declareds = Arrays.AsList(@base.StatementSpec.DeclaredExpressions);
foreach (var entry in measureExprAggNodesPerStream) {
EventType[] typesPerStream = {allTypes[entry.Key]};
AggregationServiceForgeDesc desc = AggregationServiceFactoryFactory.GetService(
entry.Value,
EmptyDictionary<ExprNode, string>.Instance,
declareds,
new ExprNode[0],
null,
EmptyList<ExprAggregateNode>.Instance,
EmptyList<ExprAggregateNode>.Instance,
EmptyList<ExprAggregateNodeGroupKey>.Instance,
false,
@base.StatementRawInfo.Annotations,
services.VariableCompileTimeResolver,
true,
null,
null,
typesPerStream,
null,
@base.ContextName,
null,
services.TableCompileTimeResolver,
false,
true,
false,
services.ImportServiceCompileTime,
@base.StatementRawInfo,
services.SerdeResolver);
aggServices[entry.Key] = desc;
}
return aggServices;
}
public void Attach(EventType parentEventType, StatementContext statementContext, ViewFactory optionalParentFactory, IList <ViewFactory> parentViewFactories)
{
_eventType = parentEventType;
// define built-in fields
var builtinTypeDef = ExpressionViewOAFieldEnumExtensions.AsMapOfTypes(_eventType);
_builtinMapType = statementContext.EventAdapterService.CreateAnonymousObjectArrayType(
statementContext.StatementId + "_exprview", builtinTypeDef);
StreamTypeService streamTypeService = new StreamTypeServiceImpl(new EventType[] { _eventType, _builtinMapType }, new String[2], new bool[2], statementContext.EngineURI, false);
// validate expression
ExpiryExpression = ViewFactorySupport.ValidateExpr(ViewName, statementContext, ExpiryExpression, streamTypeService, 0);
var summaryVisitor = new ExprNodeSummaryVisitor();
ExpiryExpression.Accept(summaryVisitor);
if (summaryVisitor.HasSubselect || summaryVisitor.HasStreamSelect || summaryVisitor.HasPreviousPrior)
{
throw new ViewParameterException("Invalid expiry expression: Sub-select, previous or prior functions are not supported in this context");
}
var returnType = ExpiryExpression.ExprEvaluator.ReturnType;
if (returnType.GetBoxedType() != typeof(bool?))
{
throw new ViewParameterException("Invalid return value for expiry expression, expected a bool return value but received " + returnType.GetParameterAsString());
}
// determine variables used, if any
var visitor = new ExprNodeVariableVisitor();
ExpiryExpression.Accept(visitor);
VariableNames = visitor.VariableNames;
// determine aggregation nodes, if any
var aggregateNodes = new List <ExprAggregateNode>();
ExprAggregateNodeUtil.GetAggregatesBottomUp(ExpiryExpression, aggregateNodes);
if (aggregateNodes.IsNotEmpty())
{
try {
AggregationServiceFactoryDesc = AggregationServiceFactoryFactory.GetService(
Collections.GetEmptyList <ExprAggregateNode>(),
Collections.GetEmptyMap <ExprNode, String>(),
Collections.GetEmptyList <ExprDeclaredNode>(),
null, aggregateNodes,
Collections.GetEmptyList <ExprAggregateNode>(),
Collections.GetEmptyList <ExprAggregateNodeGroupKey>(), false,
statementContext.Annotations,
statementContext.VariableService, false, false, null, null,
AggregationServiceFactoryServiceImpl.DEFAULT_FACTORY,
streamTypeService.EventTypes,
statementContext.MethodResolutionService, null,
statementContext.ContextName,
null, null);
}
catch (ExprValidationException ex) {
throw new ViewParameterException(ex.Message, ex);
}
}
}