Interface QueryOptimizer.OptimizationRule

All Known Implementing Classes:

QueryOptimizer.ColumnPruning, QueryOptimizer.ConstantFolding, QueryOptimizer.IndexSelection, QueryOptimizer.LimitPushDown, QueryOptimizer.PredicatePushDown

Enclosing class:

QueryOptimizer

public static sealed interface QueryOptimizer.OptimizationRule
permits QueryOptimizer.PredicatePushDown, QueryOptimizer.IndexSelection, QueryOptimizer.ColumnPruning, QueryOptimizer.ConstantFolding, QueryOptimizer.LimitPushDown

Sealed interface for optimization rules. Each rule applies a specific optimization transformation to a query plan.

Method Summary

Modifier and Type	Method	Description
QueryPlan	apply(QueryPlan plan, @Nullable QueryOptimizer.TableStatistics stats, Map<String, MapIndex<?,?>> availableIndexes)	Applies this optimization rule to the given query plan.
String	name()	Gets the name of this optimization rule.

Method Details

apply

QueryPlan apply(QueryPlan plan,
 @Nullable QueryOptimizer.TableStatistics stats,
 Map<String, MapIndex<?,?>> availableIndexes)

Applies this optimization rule to the given query plan.

Parameters:

plan - the original query plan

stats - table statistics (if available)

availableIndexes - available indexes for the table

Returns:

optimized query plan, or original if optimization cannot be applied

name

String name()

Gets the name of this optimization rule.