/// <summary>
/// Walks the chain of lookups and constructs lookup strategy and plan specification based
/// on the index specifications.
/// </summary>
/// <param name="lookupStream">the stream to construct the query plan for</param>
/// <param name="bestChain">the chain that the lookup follows to make best use of indexes</param>
/// <param name="queryGraph">the repository for key properties to indexes</param>
/// <param name="indexSpecsPerStream">specifications of indexes</param>
/// <param name="typesPerStream">event types for each stream</param>
/// <param name="isHistorical">indicator for each stream if it is a historical streams or not</param>
/// <param name="historicalStreamIndexLists">index management, populated for the query plan</param>
/// <param name="tablesPerStream">tables</param>
/// <param name="streamJoinAnalysisResult">stream join analysis</param>
/// <param name="raw">raw statement information</param>
/// <param name="serdeResolver">serde resolver</param>
/// <returns>NestedIterationNode with lookups attached underneath</returns>
public static QueryPlanNodeForgeDesc CreateStreamPlan(
int lookupStream,
int[] bestChain,
QueryGraphForge queryGraph,
QueryPlanIndexForge[] indexSpecsPerStream,
EventType[] typesPerStream,
bool[] isHistorical,
HistoricalStreamIndexListForge[] historicalStreamIndexLists,
TableMetaData[] tablesPerStream,
StreamJoinAnalysisResultCompileTime streamJoinAnalysisResult,
StatementRawInfo raw,
SerdeCompileTimeResolver serdeResolver)
{
var nestedIterNode = new NestedIterationNodeForge(bestChain);
var currentLookupStream = lookupStream;
var additionalForgeables = new List<StmtClassForgeableFactory>();
// Walk through each successive lookup
for (var i = 0; i < bestChain.Length; i++) {
var indexedStream = bestChain[i];
QueryPlanNodeForge node;
if (isHistorical[indexedStream]) {
if (historicalStreamIndexLists[indexedStream] == null) {
historicalStreamIndexLists[indexedStream] = new HistoricalStreamIndexListForge(
indexedStream,
typesPerStream,
queryGraph);
}
historicalStreamIndexLists[indexedStream].AddIndex(currentLookupStream);
node = new HistoricalDataPlanNodeForge(
indexedStream,
lookupStream,
currentLookupStream,
typesPerStream.Length,
null);
}
else {
var tableLookupPlan = CreateLookupPlan(
queryGraph,
currentLookupStream,
indexedStream,
streamJoinAnalysisResult.IsVirtualDW(indexedStream),
indexSpecsPerStream[indexedStream],
typesPerStream,
tablesPerStream[indexedStream],
raw,
serdeResolver);
node = new TableLookupNodeForge(tableLookupPlan.Forge);
additionalForgeables.AddAll(tableLookupPlan.AdditionalForgeables);
}
nestedIterNode.AddChildNode(node);
currentLookupStream = bestChain[i];
}
return new QueryPlanNodeForgeDesc(nestedIterNode, additionalForgeables);
}
public void TestCreateStreamPlan()
{
QueryPlanIndexForge[] indexes = QueryPlanIndexBuilder.BuildIndexSpec(queryGraph, typesPerStream, new string[queryGraph.NumStreams][][]);
for (int i = 0; i < indexes.Length; i++)
{
log.Debug(".testCreateStreamPlan index " + i + " = " + indexes[i]);
}
QueryPlanNodeForge plan = NStreamQueryPlanBuilder.CreateStreamPlan(0, new int[] { 2, 4, 3, 1 }, queryGraph, indexes, typesPerStream, new bool[5], null, new TableMetaData[queryGraph.NumStreams], new StreamJoinAnalysisResultCompileTime(5));
log.Debug(".testCreateStreamPlan plan=" + plan);
Assert.IsTrue(plan is NestedIterationNodeForge);
NestedIterationNodeForge nested = (NestedIterationNodeForge)plan;
TableLookupNodeForge tableLookupSpec = (TableLookupNodeForge)nested.ChildNodes[0];
// Check lookup strategy for first lookup
IndexedTableLookupPlanHashedOnlyForge lookupStrategySpec = (IndexedTableLookupPlanHashedOnlyForge)tableLookupSpec.LookupStrategySpec;
Assert.AreEqual("P01", ((ExprIdentNode)(lookupStrategySpec.HashKeys[0]).KeyExpr).ResolvedPropertyName);
Assert.AreEqual(0, lookupStrategySpec.LookupStream);
Assert.AreEqual(2, lookupStrategySpec.IndexedStream);
Assert.IsNotNull(lookupStrategySpec.IndexNum);
// Check lookup strategy for last lookup
tableLookupSpec = (TableLookupNodeForge)nested.ChildNodes[3];
FullTableScanLookupPlanForge unkeyedSpecScan = (FullTableScanLookupPlanForge)tableLookupSpec.LookupStrategySpec;
Assert.AreEqual(1, unkeyedSpecScan.IndexedStream);
Assert.IsNotNull(unkeyedSpecScan.IndexNum);
}