Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/17758#discussion_r125483095
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceValidator.scala
---
@@ -0,0 +1,36 @@
+/*
+ * 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.execution.datasources
+
+import org.apache.spark.sql.catalyst.analysis.Resolver
+import org.apache.spark.sql.types.StructType
+
+
+/**
+ * Used to validate an input schema for datasource-specific cases (e.g.,
schema definition
+ * from an datasource option and unsupported field names).
`validateSchema` is called
+ * in [[DataSource]] for the checking.
+ */
+trait DataSourceValidator {
--- End diff --
As explained above, I couldn't catch the name duplication for the JDBC
case. So, I added this interface so as to catch each datasource-specific name
duplication and other schema invalidation. But, I felt I went too far for the
corner case...
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