Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/22300#discussion_r214396672
--- Diff: sql/core/src/test/scala/org/apache/spark/sql/ExplainSuite.scala
---
@@ -0,0 +1,58 @@
+/*
+ * 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.test.SharedSQLContext
+import org.apache.spark.sql.types.StructType
+
+class ExplainSuite extends QueryTest with SharedSQLContext {
+ import testImplicits._
+
+ /**
+ * Runs the plan and makes sure the plans contains all of the keywords.
+ */
+ private def checkKeywordsExistsInExplain(df: DataFrame, keywords:
String*): Unit = {
--- End diff --
This is EXPLAIN specific verification. In the next release, we need to
further enhance EXPLAIN. I think this helper function will be changed a lot.
If this need to be shared with the other test suites, we can move it to
`QueryTest`.
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