Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19653#discussion_r148831326
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/NullHandlingSuite.scala ---
@@ -0,0 +1,130 @@
+/*
+ * 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
+
+import org.apache.spark.sql.functions._
+import org.apache.spark.sql.test.SharedSQLContext
+
+case class T1(a: Int, b: Option[Int], c: Option[Int])
+
+/**
+ * This test suite takes https://sqlite.org/nulls.html as a reference.
+ */
+class NullHandlingSuite extends QueryTest with SharedSQLContext {
--- End diff --
My original proposal is to do it in `SQLQueryTestSuite.scala` like the
other `.sql` files. Just curious why you want to write it using Dataset APIs?
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