com.espertech.esper.epl.join.plan

Class QueryPlanIndexBuilder

java.lang.Object

com.espertech.esper.epl.join.plan.QueryPlanIndexBuilder

public class QueryPlanIndexBuilder
extends Object

Build query index plans.

Constructor Summary

Constructors

Constructor and Description
QueryPlanIndexBuilder()

Method Summary

Modifier and Type	Method and Description
static QueryPlanIndex[]	buildIndexSpec(QueryGraph queryGraph, EventType[] typePerStream, String[][][] indexedStreamsUniqueProps) Build index specification from navigability info.
static SubordPropPlan	getJoinProps(ExprNode filterExpr, int outsideStreamCount, EventType[] allStreamTypesZeroIndexed, ExcludePlanHint excludePlanHint)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

QueryPlanIndexBuilder

public QueryPlanIndexBuilder()

Method Detail

buildIndexSpec

public static QueryPlanIndex[] buildIndexSpec(QueryGraph queryGraph,
                                              EventType[] typePerStream,
                                              String[][][] indexedStreamsUniqueProps)

Build index specification from navigability info.

Looks at each stream and determines which properties in the stream must be indexed in order for other streams to look up into the stream. Determines the unique set of properties to avoid building duplicate indexes on the same set of properties.

Parameters:

queryGraph - - navigability info

typePerStream - type info

indexedStreamsUniqueProps - per-stream unique props

Returns:

query index specs for each stream

getJoinProps

public static SubordPropPlan getJoinProps(ExprNode filterExpr,
                                          int outsideStreamCount,
                                          EventType[] allStreamTypesZeroIndexed,
                                          ExcludePlanHint excludePlanHint)