com.facebook.presto.sql.planner.optimizations

Class IndexJoinOptimizer.IndexKeyTracer

java.lang.Object

com.facebook.presto.sql.planner.optimizations.IndexJoinOptimizer.IndexKeyTracer

Enclosing class:

IndexJoinOptimizer

public static class IndexJoinOptimizer.IndexKeyTracer
extends Object

Identify the mapping from the lookup variables used at the top of the index plan to the actual variables produced by the IndexSource. Note that multiple top-level lookup variables may share the same underlying IndexSource symbol. Also note that lookup variables that do not correspond to underlying index source variables will be omitted from the returned Map.

Constructor Summary

Constructors

Constructor and Description
IndexKeyTracer()

Method Summary

Modifier and Type	Method and Description
static Map<VariableReferenceExpression,VariableReferenceExpression>	trace(PlanNode node, Set<VariableReferenceExpression> lookupVariables)

Methods inherited from class java.lang.Object

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

Constructor Detail

IndexKeyTracer

public IndexKeyTracer()

Method Detail

trace

public static Map<VariableReferenceExpression,VariableReferenceExpression> trace(PlanNode node,
                                                                                 Set<VariableReferenceExpression> lookupVariables)