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Allow query through router when load moving average extension (#11276)
* init commit * change NoopQuerySegmentWalker name * change doc * move NoopQuerySegmentWalker and add document * fix doc Co-authored-by: yuanyi <yuanyi@freewheel.tv>
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server/src/main/java/org/apache/druid/server/NoopQuerySegmentWalker.java
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/* | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you under the Apache License, Version 2.0 (the | ||
* "License"); you may not use this file except in compliance | ||
* with the License. You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, | ||
* software distributed under the License is distributed on an | ||
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
* KIND, either express or implied. See the License for the | ||
* specific language governing permissions and limitations | ||
* under the License. | ||
*/ | ||
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package org.apache.druid.server; | ||
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import org.apache.druid.query.Query; | ||
import org.apache.druid.query.QueryRunner; | ||
import org.apache.druid.query.QuerySegmentWalker; | ||
import org.apache.druid.query.SegmentDescriptor; | ||
import org.joda.time.Interval; | ||
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/** | ||
* An empty implementation of {@link QuerySegmentWalker}. | ||
* | ||
* Some extentions need implementation of QuerySegmentWalker, but this class will not be used in | ||
* router. Bind {@link NoopQuerySegmentWalker} in router to allow router load some extentions, which | ||
* makes query can run through router. | ||
*/ | ||
public class NoopQuerySegmentWalker implements QuerySegmentWalker | ||
{ | ||
@Override | ||
public <T> QueryRunner<T> getQueryRunnerForIntervals(Query<T> query, Iterable<Interval> intervals) | ||
{ | ||
return null; | ||
} | ||
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@Override | ||
public <T> QueryRunner<T> getQueryRunnerForSegments(Query<T> query, Iterable<SegmentDescriptor> specs) | ||
{ | ||
return null; | ||
} | ||
} |
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