public void TestComputeBestPath()
{
NStreamQueryPlanBuilder.BestChainResult bestChain = NStreamQueryPlanBuilder.ComputeBestPath(0, queryGraph, dependencyGraph);
Assert.AreEqual(3, bestChain.Depth);
Assert.IsTrue(Arrays.AreEqual(bestChain.Chain, new int[] { 2, 4, 3, 1 }));
bestChain = NStreamQueryPlanBuilder.ComputeBestPath(3, queryGraph, dependencyGraph);
Assert.AreEqual(4, bestChain.Depth);
Assert.IsTrue(Arrays.AreEqual(bestChain.Chain, new int[] { 4, 2, 0, 1 }));
// try a stream that is not connected in any way
queryGraph = new QueryGraphForge(6, null, false);
bestChain = NStreamQueryPlanBuilder.ComputeBestPath(5, queryGraph, dependencyGraph);
log.Debug(".testComputeBestPath bestChain=" + bestChain);
Assert.AreEqual(0, bestChain.Depth);
Assert.IsTrue(Arrays.AreEqual(bestChain.Chain, new int[] { 0, 1, 2, 3, 4 }));
}
private static QueryPlanNodeForgeDesc BuildPlanNode(
int numStreams,
int streamNo,
string[] streamNames,
QueryGraphForge queryGraph,
OuterInnerDirectionalGraph outerInnerGraph,
OuterJoinDesc[] outerJoinDescList,
InnerJoinGraph innerJoinGraph,
QueryPlanIndexForge[] indexSpecs,
EventType[] typesPerStream,
bool[] isHistorical,
DependencyGraph dependencyGraph,
HistoricalStreamIndexListForge[] historicalStreamIndexLists,
TableMetaData[] tablesPerStream,
StreamJoinAnalysisResultCompileTime streamJoinAnalysisResult,
StatementRawInfo statementRawInfo,
StatementCompileTimeServices services)
{
// For each stream build an array of substreams, considering required streams (inner joins) first
// The order is relevant therefore preserving order via a LinkedHashMap.
var substreamsPerStream = new LinkedHashMap<int, int[]>();
var requiredPerStream = new bool[numStreams];
var additionalForgeables = new List<StmtClassForgeableFactory>();
// Recursive populating the required (outer) and optional (inner) relationships
// of this stream and the substream
ISet<int> completedStreams = new HashSet<int>();
// keep track of tree path as only those stream events are always available to historical streams
var streamCallStack = new Stack<int>();
streamCallStack.Push(streamNo);
// For all inner-joins, the algorithm is slightly different
if (innerJoinGraph.IsAllInnerJoin) {
requiredPerStream.Fill(true);
RecursiveBuildInnerJoin(
streamNo,
streamCallStack,
queryGraph,
completedStreams,
substreamsPerStream,
dependencyGraph);
// compute a best chain to see if all streams are handled and add the remaining
var bestChain = NStreamQueryPlanBuilder.ComputeBestPath(streamNo, queryGraph, dependencyGraph);
AddNotYetNavigated(streamNo, numStreams, substreamsPerStream, bestChain);
}
else {
RecursiveBuild(
streamNo,
streamCallStack,
queryGraph,
outerInnerGraph,
innerJoinGraph,
completedStreams,
substreamsPerStream,
requiredPerStream,
dependencyGraph);
}
// verify the substreamsPerStream, all streams must exists and be linked
VerifyJoinedPerStream(streamNo, substreamsPerStream);
// build list of instructions for lookup
LookupInstructionPlanDesc lookupDesc = BuildLookupInstructions(
streamNo,
substreamsPerStream,
requiredPerStream,
streamNames,
queryGraph,
indexSpecs,
typesPerStream,
outerJoinDescList,
isHistorical,
historicalStreamIndexLists,
tablesPerStream,
streamJoinAnalysisResult,
statementRawInfo,
services);
var lookupInstructions = lookupDesc.Forges;
additionalForgeables.AddAll(lookupDesc.AdditionalForgeables);
// build historical index and lookup strategies
foreach (var lookups in lookupInstructions) {
foreach (var historical in lookups.HistoricalPlans) {
if (historical == null) {
continue;
}
JoinSetComposerPrototypeHistoricalDesc desc = historicalStreamIndexLists[historical.StreamNum]
.GetStrategy(historical.LookupStreamNum, statementRawInfo, services.SerdeResolver);
historical.HistoricalIndexLookupStrategy = desc.LookupForge;
historical.PollResultIndexingStrategy = desc.IndexingForge;
additionalForgeables.AddAll(desc.AdditionalForgeables);
}
}
// build strategy tree for putting the result back together
var assemblyTopNodeFactory = AssemblyStrategyTreeBuilder.Build(
streamNo,
substreamsPerStream,
requiredPerStream);
var assemblyInstructionFactories =
BaseAssemblyNodeFactory.GetDescendentNodesBottomUp(assemblyTopNodeFactory);
var forge = new LookupInstructionQueryPlanNodeForge(
streamNo,
streamNames[streamNo],
numStreams,
requiredPerStream,
lookupInstructions,
assemblyInstructionFactories);
return new QueryPlanNodeForgeDesc(forge, additionalForgeables);
}
