spark SupportsReportStatistics 源码
spark SupportsReportStatistics 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsReportStatistics.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;
/**
* A mix in interface for {@link Scan}. Data sources can implement this interface to
* report statistics to Spark.
* <p>
* As of Spark 3.0, statistics are reported to the optimizer after operators are pushed to the
* data source. Implementations may return more accurate statistics based on pushed operators
* which may improve query performance by providing better information to the optimizer.
*
* @since 3.0.0
*/
@Evolving
public interface SupportsReportStatistics extends Scan {
/**
* Returns the estimated statistics of this data source scan.
*/
Statistics estimateStatistics();
}
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