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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