Package io.trino.cost

Interface StatsCalculator

All Known Implementing Classes:

ComposableStatsCalculator

public interface StatsCalculator

Method Summary

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

Method Details

calculateStats

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

Calculate stats for the node.

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.

tableStatsProvider - The table stats provider.

noopStatsCalculator

static StatsCalculator noopStatsCalculator()