Address comments.

Author: viirya

sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala

@@ -1196,16 +1196,11 @@ class SparkSqlAstBuilder(conf: SQLConf) extends AstBuilder(conf) {
 
     selectQuery match {
       case Some(q) =>
-        // Hive does not allow to use a CTAS statement to create a partitioned table
-        // by specifying table schema.
+        // When creating partitioned table with CTAS statement, we can't specify data type for the
+        // partition columns.
         if (tableDesc.partitionColumnNames.nonEmpty) {
-          val errorMessage = "A Create Table As Select (CTAS) statement is not allowed to " +
-            "create a partitioned table using Hive's file formats by specifying table schema. " +
-            "Please use the syntax of \"CREATE TABLE tableName USING dataSource " +
-            "OPTIONS (...) PARTITIONED BY ...\" to create a partitioned table through a " +
-            "CTAS statement. You can specify partition column names in CTAS statement like " +
-            "\"PARTITIONED BY (col_name, col_name, ...)\" when using Hive's file formats to " +
-            "create a partitioned table too."
+          val errorMessage = "Create Partitioned Table As Select cannot specify data type for " +
+            "the partition columns of the target table."
           operationNotAllowed(errorMessage, ctx)
         }
 

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/HiveDDLSuite.scala

@@ -2381,8 +2381,8 @@ class HiveDDLSuite
            |AS SELECT 1 as a, "a" as b
                  """.stripMargin)
     }.getMessage
-    assert(err1.contains("A Create Table As Select (CTAS) statement is not allowed " +
-      "to create a partitioned table using Hive's file formats by specifying table schema"))
+    assert(err1.contains("Create Partitioned Table As Select cannot specify data type for " +
+      "the partition columns of the target table"))
 
     val err2 = intercept[ParseException] {
       spark.sql(
@@ -2393,8 +2393,8 @@ class HiveDDLSuite
            |AS SELECT 1 as a, "a" as b
                  """.stripMargin)
     }.getMessage
-    assert(err2.contains("A Create Table As Select (CTAS) statement is not allowed " +
-      "to create a partitioned table using Hive's file formats by specifying table schema"))
+    assert(err2.contains("Create Partitioned Table As Select cannot specify data type for " +
+      "the partition columns of the target table"))
   }
 
   test("Hive CTAS with dynamic partition") {
@@ -2410,15 +2410,8 @@ class HiveDDLSuite
                """.stripMargin)
           checkAnswer(spark.table("t"), Row(1, "a"))
 
-          assert(sql("DESC t").collect().containsSlice(
-            Seq(
-              Row("a", "int", null),
-              Row("b", "string", null),
-              Row("# Partition Information", "", ""),
-              Row("# col_name", "data_type", "comment"),
-              Row("b", "string", null)
-            )
-          ))
+          assert(spark.sessionState.catalog.getTableMetadata(TableIdentifier("t"))
+            .partitionColumnNames === Seq("b"))
         }
       }
     }