io.prestosql.cost

Class ComposableStatsCalculator

java.lang.Object

io.prestosql.cost.ComposableStatsCalculator

All Implemented Interfaces:

StatsCalculator

public class ComposableStatsCalculator
extends Object
implements StatsCalculator

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	ComposableStatsCalculator.Rule<T extends PlanNode>

Constructor Summary

Constructors

Constructor and Description
ComposableStatsCalculator(List<ComposableStatsCalculator.Rule<?>> rules)

Method Summary

Modifier and Type	Method and Description
PlanNodeStatsEstimate	calculateStats(PlanNode node, StatsProvider sourceStats, Lookup lookup, Session session, TypeProvider types) Calculate stats for the node.

Methods inherited from class java.lang.Object

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

Constructor Detail

ComposableStatsCalculator

public ComposableStatsCalculator(List<ComposableStatsCalculator.Rule<?>> rules)

Method Detail

calculateStats

public PlanNodeStatsEstimate calculateStats(PlanNode node,
                                            StatsProvider sourceStats,
                                            Lookup lookup,
                                            Session session,
                                            TypeProvider types)

Description copied from interface: StatsCalculator

Calculate stats for the node.

Specified by:

calculateStats in interface StatsCalculator

Parameters:

node - The node to compute stats for.

sourceStats - The stats provider for any child nodes' stats, if needed to compute stats for the node

lookup - Lookup to be used when resolving source nodes, allowing stats calculation to work within IterativeOptimizer

types - The type provider for all symbols in the scope.