Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/20201#discussion_r163008839 --- Diff: sql/core/src/main/java/org/apache/spark/sql/sources/v2/reader/Partitioning.java --- @@ -0,0 +1,46 @@ +/* + * 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.sources.v2.reader; + +import org.apache.spark.annotation.InterfaceStability; + +/** + * An interface to represent the output data partitioning for a data source, which is returned by + * {@link SupportsReportPartitioning#outputPartitioning()}. Note that this should work like a + * snapshot. Once created, it should be deterministic and always report same number of partitions + * and same "satisfy" result for a certain distribution. + */ +@InterfaceStability.Evolving +public interface Partitioning { + + /** + * Returns the number of partitions/{@link ReadTask}s the data source outputs. --- End diff -- `Returns the number of partitions/(i.e., {@link ReadTask}s) that the data source outputs.`
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