io.prestosql.sql.planner.optimizations

Class MetadataQueryOptimizer

java.lang.Object

io.prestosql.sql.planner.optimizations.MetadataQueryOptimizer

All Implemented Interfaces:

PlanOptimizer

public class MetadataQueryOptimizer
extends Object
implements PlanOptimizer

Converts cardinality-insensitive aggregations (max, min, "distinct") over partition keys into simple metadata queries

Constructor Summary

Constructors

Constructor and Description
MetadataQueryOptimizer(Metadata metadata)

Method Summary

Modifier and Type	Method and Description
PlanNode	optimize(PlanNode plan, Session session, TypeProvider types, SymbolAllocator symbolAllocator, PlanNodeIdAllocator idAllocator, WarningCollector warningCollector)

Methods inherited from class java.lang.Object

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

Constructor Detail

MetadataQueryOptimizer

public MetadataQueryOptimizer(Metadata metadata)

Method Detail

optimize

public PlanNode optimize(PlanNode plan,
                         Session session,
                         TypeProvider types,
                         SymbolAllocator symbolAllocator,
                         PlanNodeIdAllocator idAllocator,
                         WarningCollector warningCollector)

Specified by:

optimize in interface PlanOptimizer