[GitHub] [spark] huaxingao commented on a change in pull request #29972: [SPARK-33081][SQL] Support ALTER TABLE in JDBC v2 Table Catalog: update type and nullability of columns (DB2 dialect)

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huaxingao commented on a change in pull request #29972:
URL: https://github.com/apache/spark/pull/29972#discussion_r501482051



##########
File path: external/docker-integration-tests/src/test/scala/org/apache/spark/sql/jdbc/v2/DB2IntegrationSuite.scala
##########
@@ -0,0 +1,113 @@
+/*
+ * 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.jdbc.v2
+
+import java.sql.Connection
+
+import org.scalatest.time.SpanSugar._
+
+import org.apache.spark.SparkConf
+import org.apache.spark.sql.AnalysisException
+import org.apache.spark.sql.catalyst.parser.ParseException
+import org.apache.spark.sql.execution.datasources.v2.jdbc.JDBCTableCatalog
+import org.apache.spark.sql.jdbc.{DatabaseOnDocker, DockerJDBCIntegrationSuite}
+import org.apache.spark.sql.test.SharedSparkSession
+import org.apache.spark.sql.types._
+import org.apache.spark.tags.DockerTest
+
+/**
+ * To run this test suite for a specific version (e.g., ibmcom/db2:11.5.4.0):
+ * {{{
+ *   DB2_DOCKER_IMAGE_NAME=ibmcom/db2:11.5.4.0

Review comment:
       In Oracle docker test, it has instructions for how to build docker image. In DB2 docker test and all the other docker tests, it is assumed that the docker images are there and only has instruction for how to run the tests. That's why DB2 docker test looks much simpler. 
   e.g. here is what we have for MS SQL Server docker test
   ```
   /**
    * To run this test suite for a specific version (e.g., 2019-GA-ubuntu-16.04):
    * {{{
    *   MSSQLSERVER_DOCKER_IMAGE_NAME=2019-GA-ubuntu-16.04
    *     ./build/sbt -Pdocker-integration-tests "test-only *MsSqlServerIntegrationSuite"
    * }}}
    */
   ```




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