Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19136#discussion_r138947297
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/ReadSupportWithSchema.java
---
@@ -0,0 +1,45 @@
+/*
+ * 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;
+
+import org.apache.spark.sql.sources.v2.reader.DataSourceV2Reader;
+import org.apache.spark.sql.types.StructType;
+
+/**
+ * A mix-in interface for `DataSourceV2`. Users can implement this
interface to provide data reading
+ * ability and scan the data from the data source.
+ *
+ * This is a variant of `ReadSupport` that accepts user-specified schema
when reading data. A data
+ * source can implement both `ReadSupport` and `ReadSupportWithSchema` if
it supports both schema
+ * inference and user-specified schema.
+ */
+public interface ReadSupportWithSchema {
--- End diff --
I still find ReadSupport vs ReadSupportWithSchema pretty confusing. But
let's address that separately.
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