/// <summary>
/// Build query plan.
/// </summary>
/// <param name="typesPerStream">event types for each stream</param>
/// <param name="queryGraph">navigability info</param>
/// <param name="optionalOuterJoinType">outer join type, null if not an outer join</param>
/// <param name="uniqueIndexProps">The unique index props.</param>
/// <param name="tablesPerStream">The tables per stream.</param>
/// <returns>
/// query plan
/// </returns>
public static QueryPlan Build(EventType[] typesPerStream, QueryGraph queryGraph, OuterJoinType?optionalOuterJoinType, string[][][] uniqueIndexProps, TableMetadata[] tablesPerStream)
{
var indexSpecs = QueryPlanIndexBuilder.BuildIndexSpec(queryGraph, typesPerStream, uniqueIndexProps);
var execNodeSpecs = new QueryPlanNode[2];
var lookupPlans = new TableLookupPlan[2];
// plan lookup from 1 to zero
lookupPlans[1] = NStreamQueryPlanBuilder.CreateLookupPlan(queryGraph, 1, 0, indexSpecs[0], typesPerStream, tablesPerStream[0]);
// plan lookup from zero to 1
lookupPlans[0] = NStreamQueryPlanBuilder.CreateLookupPlan(queryGraph, 0, 1, indexSpecs[1], typesPerStream, tablesPerStream[1]);
execNodeSpecs[0] = new TableLookupNode(lookupPlans[0]);
execNodeSpecs[1] = new TableLookupNode(lookupPlans[1]);
if (optionalOuterJoinType != null)
{
if ((optionalOuterJoinType.Equals(OuterJoinType.LEFT)) ||
(optionalOuterJoinType.Equals(OuterJoinType.FULL)))
{
execNodeSpecs[0] = new TableOuterLookupNode(lookupPlans[0]);
}
if ((optionalOuterJoinType.Equals(OuterJoinType.RIGHT)) ||
(optionalOuterJoinType.Equals(OuterJoinType.FULL)))
{
execNodeSpecs[1] = new TableOuterLookupNode(lookupPlans[1]);
}
}
return(new QueryPlan(indexSpecs, execNodeSpecs));
}
private static IList <LookupInstructionPlan> BuildLookupInstructions(
int rootStreamNum,
LinkedHashMap <int, int[]> substreamsPerStream,
bool[] requiredPerStream,
string[] streamNames,
QueryGraph queryGraph,
QueryPlanIndex[] indexSpecs,
EventType[] typesPerStream,
OuterJoinDesc[] outerJoinDescList,
bool[] isHistorical,
HistoricalStreamIndexList[] historicalStreamIndexLists,
ExprEvaluatorContext exprEvaluatorContext,
TableMetadata[] tablesPerStream)
{
IList <LookupInstructionPlan> result = new List <LookupInstructionPlan>();
foreach (int fromStream in substreamsPerStream.Keys)
{
var substreams = substreamsPerStream.Get(fromStream);
// for streams with no substreams we don't need to look up
if (substreams.Length == 0)
{
continue;
}
var plans = new TableLookupPlan[substreams.Length];
var historicalPlans = new HistoricalDataPlanNode[substreams.Length];
for (var i = 0; i < substreams.Length; i++)
{
var toStream = substreams[i];
if (isHistorical[toStream])
{
// There may not be an outer-join descriptor, use if provided to build the associated expression
ExprNode outerJoinExpr = null;
if (outerJoinDescList.Length > 0)
{
OuterJoinDesc outerJoinDesc;
if (toStream == 0)
{
outerJoinDesc = outerJoinDescList[0];
}
else
{
outerJoinDesc = outerJoinDescList[toStream - 1];
}
outerJoinExpr = outerJoinDesc.MakeExprNode(exprEvaluatorContext);
}
if (historicalStreamIndexLists[toStream] == null)
{
historicalStreamIndexLists[toStream] = new HistoricalStreamIndexList(toStream, typesPerStream, queryGraph);
}
historicalStreamIndexLists[toStream].AddIndex(fromStream);
historicalPlans[i] = new HistoricalDataPlanNode(toStream, rootStreamNum, fromStream, typesPerStream.Length, outerJoinExpr);
}
else
{
plans[i] = NStreamQueryPlanBuilder.CreateLookupPlan(queryGraph, fromStream, toStream, indexSpecs[toStream], typesPerStream, tablesPerStream[toStream]);
}
}
var fromStreamName = streamNames[fromStream];
var instruction = new LookupInstructionPlan(fromStream, fromStreamName, substreams, plans, historicalPlans, requiredPerStream);
result.Add(instruction);
}
return(result);
}
