[fix](type compatibility) fix unsigned int type compatibility problem

fe/fe-core/src/main/cup/sql_parser.cup

@@ -5744,6 +5744,9 @@ type ::=
   {: RESULT = Type.SMALLINT; :}
   | opt_signed_unsigned KW_INT opt_field_length
   {: RESULT = Type.INT; :}
+  // This is just for MySQL compatibility now.
+  | KW_UNSIGNED KW_INT opt_field_length
+  {: RESULT = Type.BIGINT; :}
   | KW_BIGINT opt_field_length
   {: RESULT = Type.BIGINT; :}
   | KW_LARGEINT opt_field_length
@@ -5848,8 +5851,6 @@ opt_signed_unsigned ::=
   {: RESULT = true; :}
   | KW_SIGNED
   {: RESULT = true; :}
-  | KW_UNSIGNED
-  {: RESULT = false; :}
   ;
 
 type_def ::=

regression-test/data/types_p0/unsigned/test_unsigned_int_compatibility.out

@@ -0,0 +1,18 @@
+-- This file is automatically generated. You should know what you did if you want to edit this
+-- !desc_tb --
+user_id	LARGEINT	No	true	\N	
+city	VARCHAR(20)	Yes	true	\N	
+value1	BIGINT	Yes	false	\N	REPLACE
+
+-- !select_tb --
+1	Beijing	21474836478
+
+-- !desc_tb --
+user_id	LARGEINT	No	true	\N	
+city	VARCHAR(20)	Yes	true	\N	
+value1	BIGINT	Yes	false	\N	REPLACE
+value2	BIGINT	Yes	false	\N	REPLACE
+
+-- !select_tb --
+1	Beijing	21474836478	\N
+2	Beijing	21474836478	21474836478

regression-test/suites/types_p0/unsigned/test_unsigned_int_compatibility.groovy

@@ -0,0 +1,55 @@
+// 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.
+
+suite("test_unsigned_int_compatibility") {
+    def tableName = "test_unsigned_int_compatibility"
+
+    sql """DROP TABLE IF EXISTS ${tableName}"""
+    sql """
+        CREATE TABLE IF NOT EXISTS ${tableName} (
+            `user_id` LARGEINT NOT NULL COMMENT "用户id",
+            `city` VARCHAR(20) COMMENT "用户所在城市",
+            `value1` UNSIGNED INT COMMENT "value2"
+        )
+        UNIQUE KEY(`user_id`, `city`) 
+        DISTRIBUTED BY HASH(`user_id`)
+        PROPERTIES ( 
+            "replication_num" = "1" , 
+            "light_schema_change" = "true"
+        );
+        """
+    qt_desc_tb "DESC ${tableName}"
+
+    sql """ 
+        INSERT INTO ${tableName} VALUES
+                (1, 'Beijing', 21474836478);
+        """
+    qt_select_tb "SELECT * FROM ${tableName}"
+
+    sql """
+        ALTER table ${tableName} ADD COLUMN value2 UNSIGNED INT;
+        """
+    qt_desc_tb "DESC ${tableName}"
+
+    sql """ 
+        INSERT INTO ${tableName} VALUES
+                (2, 'Beijing', 21474836478, 21474836478);
+        """
+    qt_select_tb "SELECT * FROM ${tableName} order by user_id"
+
+    sql "DROP TABLE ${tableName}"
+}