org.apache.druid.query

Class PerSegmentOptimizingQueryRunner<T>

java.lang.Object

org.apache.druid.query.PerSegmentOptimizingQueryRunner<T>

Type Parameters:

T -

All Implemented Interfaces:

QueryRunner<T>

public class PerSegmentOptimizingQueryRunner<T>
extends Object
implements QueryRunner<T>

This runner optimizes queries made on a single segment, using per-segment information, before submitting the queries to the base runner. Example optimizations include adjusting query filters based on per-segment information, such as intervals. This query runner should only wrap base query runners that will be used to query a single segment (i.e., when the query reaches a historical node).

Constructor Summary

Constructors

Constructor and Description
PerSegmentOptimizingQueryRunner(QueryRunner<T> base, PerSegmentQueryOptimizationContext optimizationContext)

Method Summary

Modifier and Type	Method and Description
Sequence<T>	run(QueryPlus<T> input, Map<String,Object> responseContext) Runs the given query and returns results in a time-ordered sequence.

Methods inherited from class java.lang.Object

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

Constructor Detail

PerSegmentOptimizingQueryRunner

public PerSegmentOptimizingQueryRunner(QueryRunner<T> base,
                                       PerSegmentQueryOptimizationContext optimizationContext)

Method Detail

run

public Sequence<T> run(QueryPlus<T> input,
                       Map<String,Object> responseContext)

Description copied from interface: QueryRunner

Runs the given query and returns results in a time-ordered sequence.

Specified by:

run in interface QueryRunner<T>