Class QueryOptimizer.PredicatePushDown

java.lang.Object

com.loomcache.server.query.QueryOptimizer.PredicatePushDown

All Implemented Interfaces:

QueryOptimizer.OptimizationRule

Enclosing class:

QueryOptimizer

public static final class QueryOptimizer.PredicatePushDown
extends Object
implements QueryOptimizer.OptimizationRule

Predicate push-down optimization: moves predicates closer to the data source.

Constructor Summary

Constructors

Constructor	Description
PredicatePushDown()

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.

Methods inherited from class Object

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

Constructor Details

PredicatePushDown

public PredicatePushDown()

Method Details

name

public String name()

Description copied from interface: QueryOptimizer.OptimizationRule

Gets the name of this optimization rule.

Specified by:

name in interface QueryOptimizer.OptimizationRule

apply

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

Description copied from interface: QueryOptimizer.OptimizationRule

Applies this optimization rule to the given query plan.

Specified by:

apply in interface QueryOptimizer.OptimizationRule

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