Peng-Lei commented on a change in pull request #34719:
URL: https://github.com/apache/spark/pull/34719#discussion_r757256714



##########
File path: 
sql/core/src/test/scala/org/apache/spark/sql/execution/command/v1/ShowCreateTableSuite.scala
##########
@@ -0,0 +1,140 @@
+/*
+ * 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.command.v1
+
+import org.apache.spark.sql.catalyst.TableIdentifier
+import org.apache.spark.sql.catalyst.catalog.CatalogTable
+import org.apache.spark.sql.execution.command
+
+/**
+ * This base suite contains unified tests for the `SHOW CREATE TABLE` command 
that checks V1
+ * table catalogs. The tests that cannot run for all V1 catalogs are located 
in more
+ * specific test suites:
+ *
+ *   - V1 In-Memory catalog: 
`org.apache.spark.sql.execution.command.v1.ShowCreateTableSuite`
+ *   - V1 Hive External catalog:
+ *     `org.apache.spark.sql.hive.execution.command.ShowCreateTableSuite`
+ */
+trait ShowCreateTableSuiteBase extends command.ShowCreateTableSuiteBase
+    with command.TestsV1AndV2Commands {
+
+  test("CATS") {
+    val table = "ddl_test"
+    withTable(table) {
+      sql(
+        s"""CREATE TABLE $table
+           |USING json
+           |PARTITIONED BY (c)
+           |CLUSTERED BY (a) SORTED BY (b) INTO 2 BUCKETS
+           |COMMENT 'This is a comment'
+           |TBLPROPERTIES ('a' = '1')
+           |AS SELECT 1 AS a, "foo" AS b, 2.5 AS c
+         """.stripMargin
+      )
+      checkCreateTable(table)
+    }
+  }
+
+  protected def checkCreateTable(table: String, serde: Boolean = false): Unit 
= {
+    checkCreateTableOrView(TableIdentifier(table, Some("default")), "TABLE", 
serde)
+  }
+
+  protected def checkCreateView(table: String, serde: Boolean = false): Unit = 
{
+    checkCreateTableOrView(TableIdentifier(table, Some("default")), "VIEW", 
serde)
+  }
+
+  protected def checkCreateTableOrView(
+      table: TableIdentifier,
+      checkType: String,
+      serde: Boolean): Unit = {
+    val db = table.database.getOrElse("default")
+    val expected = spark.sharedState.externalCatalog.getTable(db, table.table)
+    val shownDDL = if (serde) {
+      sql(s"SHOW CREATE TABLE ${table.quotedString} AS 
SERDE").head().getString(0)
+    } else {
+      sql(s"SHOW CREATE TABLE ${table.quotedString}").head().getString(0)
+    }
+    sql(s"DROP $checkType ${table.quotedString}")
+    try {
+      sql(shownDDL)
+      val actual = spark.sharedState.externalCatalog.getTable(db, table.table)
+      checkCatalogTables(expected, actual)
+    } finally {
+      sql(s"DROP $checkType IF EXISTS ${table.table}")
+    }
+  }
+
+  protected def checkCatalogTables(expected: CatalogTable, actual: 
CatalogTable): Unit = {
+    assert(CatalogTable.normalize(actual) == CatalogTable.normalize(expected))
+  }
+}
+
+/**
+ * The class contains tests for the `SHOW CREATE TABLE` command to check V1 
In-Memory
+ * table catalog.
+ */
+class ShowCreateTableSuite extends ShowCreateTableSuiteBase with 
CommandSuiteBase {
+  override def commandVersion: String = 
super[ShowCreateTableSuiteBase].commandVersion
+
+  test("SHOW CREATE TABLE") {
+    val t = "tbl"
+    withTable(t) {
+      sql(
+        s"""
+           |CREATE TABLE $t (
+           |  a bigint NOT NULL,
+           |  b bigint,
+           |  c bigint,
+           |  `extraCol` ARRAY<INT>,
+           |  `<another>` STRUCT<x: INT, y: ARRAY<BOOLEAN>>
+           |)
+           |$defaultUsing
+           |OPTIONS (
+           |  from = 0,
+           |  to = 1,
+           |  via = 2)
+           |COMMENT 'This is a comment'
+           |TBLPROPERTIES ('prop1' = '1', 'prop2' = '2', 'prop3' = 3, 'prop4' 
= 4)
+           |PARTITIONED BY (a)
+           |LOCATION '/tmp'
+        """.stripMargin)
+      val showDDL = getShowCreateDDL(s"SHOW CREATE TABLE $t")
+      assert(showDDL === Array(
+        s"CREATE TABLE `default`.`$t` (",
+        "`b` BIGINT,",
+        "`c` BIGINT,",
+        "`extraCol` ARRAY<INT>,",
+        "`<another>` STRUCT<`x`: INT, `y`: ARRAY<BOOLEAN>>,",
+        "`a` BIGINT NOT NULL)",
+        defaultUsing,
+        "OPTIONS (",
+        "`from` '0',",
+        "`to` '1',",
+        "`via` '2')",
+        "PARTITIONED BY (a)",
+        "COMMENT 'This is a comment'",
+        "LOCATION 'file:/tmp'",
+        "TBLPROPERTIES (",
+        "'prop1' = '1',",
+        "'prop2' = '2',",
+        "'prop3' = '3',",
+        "'prop4' = '4')"
+      ))
+    }

Review comment:
       diff with V2:
   1.Options ` \\`key\\`  ` \\`value\\``  instead of `'key' = 'value'`
   2.Partition column is at last of columns
   3.location start with `file:`
   4.`TBLPROPERTIES (` insted of `TBLPROPERTIES(`




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