spark SupportsReportOrdering 源码
spark SupportsReportOrdering 代码
文件路径：/sql/catalyst/src/main/java/org/apache/spark/sql/connector/read/SupportsReportOrdering.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.connector.expressions.SortOrder;
/**
* A mix in interface for {@link Scan}. Data sources can implement this interface to
* report the order of data in each partition to Spark.
* Global order is part of the partitioning, see {@link SupportsReportPartitioning}.
* <p>
* Spark uses ordering information to exploit existing order to avoid sorting required by
* subsequent operations.
*
* @since 3.4.0
*/
@Evolving
public interface SupportsReportOrdering extends Scan {
/**
* Returns the order in each partition of this data source scan.
*/
SortOrder[] outputOrdering();
}
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