Package org.apache.druid.server

Class QuerySwappingQueryRunner<T>

java.lang.Object

org.apache.druid.server.QuerySwappingQueryRunner<T>

All Implemented Interfaces:

QueryRunner<T>

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

A QueryRunner which validates that a *specific* query is passed in, and then swaps it with another one. Useful in passing the modified query to the underlying runners, since the {@link QuerySegmentWalker#} Useful since walkers might need to enrich the query with additional parameters and the callers actually calling the `run()` won't know about this modification. It validates that the query passed to the `run()` was the same query that was passed while creating the runner, to ensure that the enrichment was done to the correct query.

Constructor Summary

Constructors

Constructor	Description
QuerySwappingQueryRunner(QueryRunner<T> baseRunner, Query<T> query, Query<T> newQuery)

Method Summary

Modifier and Type	Method	Description
Sequence<T>	run(QueryPlus<T> queryPlus, ResponseContext responseContext)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.druid.query.QueryRunner

run

Constructor Details

QuerySwappingQueryRunner

public QuerySwappingQueryRunner(QueryRunner<T> baseRunner,
 Query<T> query,
 Query<T> newQuery)

Method Details

run

public Sequence<T> run(QueryPlus<T> queryPlus,
 ResponseContext responseContext)

Specified by:

run in interface QueryRunner<T>