spark SupportsPushDownFilters 源码
spark SupportsPushDownFilters 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsPushDownFilters.java
/*
* 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.
*/
package org.apache.spark.sql.connector.read;
import org.apache.spark.annotation.Evolving;
import org.apache.spark.sql.sources.Filter;
/**
* A mix-in interface for {@link ScanBuilder}. Data sources can implement this interface to
* push down filters to the data source and reduce the size of the data to be read.
*
* @since 3.0.0
*/
@Evolving
public interface SupportsPushDownFilters extends ScanBuilder {
/**
* Pushes down filters, and returns filters that need to be evaluated after scanning.
* <p>
* Rows should be returned from the data source if and only if all of the filters match. That is,
* filters must be interpreted as ANDed together.
*/
Filter[] pushFilters(Filter[] filters);
/**
* Returns the filters that are pushed to the data source via {@link #pushFilters(Filter[])}.
* <p>
* There are 3 kinds of filters:
* <ol>
* <li>pushable filters which don't need to be evaluated again after scanning.</li>
* <li>pushable filters which still need to be evaluated after scanning, e.g. parquet row
* group filter.</li>
* <li>non-pushable filters.</li>
* </ol>
* <p>
* Both case 1 and 2 should be considered as pushed filters and should be returned by this method.
* <p>
* It's possible that there is no filters in the query and {@link #pushFilters(Filter[])}
* is never called, empty array should be returned for this case.
*/
Filter[] pushedFilters();
}
相关信息
相关文章
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
7、 golang
-
9、 openharmony
-
10、 Vue中input框自动聚焦