Github user gengliangwang commented on a diff in the pull request: https://github.com/apache/spark/pull/22009#discussion_r208133162 --- Diff: sql/core/src/main/java/org/apache/spark/sql/sources/v2/reader/ReadSupport.java --- @@ -0,0 +1,61 @@ +/* + * 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; +import org.apache.spark.sql.types.StructType; + +/** + * The base interface for all the batch and streaming read supports. Data sources should implement + * concrete read support interfaces like {@link BatchReadSupport}. + */ +@InterfaceStability.Evolving +public interface ReadSupport { + + /** + * Returns the full schema of this data source, which is usually the physical schema of the + * underlying storage. This full schema should not be affected by column pruning or other + * optimizations. + * + * If this method fails (by throwing an exception), the action will fail and no Spark job will be + * submitted. + */ + StructType fullSchema(); --- End diff -- Can we change this API to return a `ScanConfigBuilder`?
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