io.prestosql.sql.planner.optimizations

Class IndexJoinOptimizer.IndexKeyTracer

java.lang.Object

io.prestosql.sql.planner.optimizations.IndexJoinOptimizer.IndexKeyTracer

Enclosing class:

IndexJoinOptimizer

public static class IndexJoinOptimizer.IndexKeyTracer
extends Object

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

Constructor Summary

Constructors

Constructor and Description
IndexKeyTracer()

Method Summary

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

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<Symbol,Symbol> trace(PlanNode node,
                                       Set<Symbol> lookupSymbols)