Bug #26791931: INCORRECT BEHAVIOR IN ALTER TABLE REORGANIZE

               PARTITION

Issue:
------
ALTER TABLE REORGANIZE PARTITION .... can result in
incorrect behavior if any partition other than the last
one misses the "VALUES LESS THAN..." part of the syntax.

Root cause:
-----------
Currently ALTER TABLE with changes to partitions is handled
incorrectly by the parser.

Fix:
----
The if condition which handles partition management
differently for ALTER TABLE in the parser should be removed.
 Change the code to handle the case in the parser.

sql/sql_yacc.yy

 /*
-   Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
+   Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -4670,57 +4670,48 @@ opt_part_values:
           {
             LEX *lex= Lex;
             partition_info *part_info= lex->part_info;
-            if (! lex->is_partition_management())
-            {
-              if (part_info->part_type == RANGE_PARTITION)
+            if (part_info->part_type == NOT_A_PARTITION)
+              part_info->part_type= HASH_PARTITION;
+            else if (part_info->part_type == RANGE_PARTITION)
             {
               my_error(ER_PARTITION_REQUIRES_VALUES_ERROR, MYF(0),
                        "RANGE", "LESS THAN");
               MYSQL_YYABORT;
             }
-              if (part_info->part_type == LIST_PARTITION)
+            else if (part_info->part_type == LIST_PARTITION)
             {
               my_error(ER_PARTITION_REQUIRES_VALUES_ERROR, MYF(0),
                        "LIST", "IN");
               MYSQL_YYABORT;
             }
           }
-            else
-              part_info->part_type= HASH_PARTITION;
-          }
         | VALUES LESS_SYM THAN_SYM
           {
             LEX *lex= Lex;
             partition_info *part_info= lex->part_info;
-            if (! lex->is_partition_management())
-            {
-              if (part_info->part_type != RANGE_PARTITION)
+            if (part_info->part_type == NOT_A_PARTITION)
+              part_info->part_type= RANGE_PARTITION;
+            else if (part_info->part_type != RANGE_PARTITION)
             {
               my_error(ER_PARTITION_WRONG_VALUES_ERROR, MYF(0),
                        "RANGE", "LESS THAN");
               MYSQL_YYABORT;
             }
           }
-            else
-              part_info->part_type= RANGE_PARTITION;
-          }
           part_func_max {}
         | VALUES IN_SYM
           {
             LEX *lex= Lex;
             partition_info *part_info= lex->part_info;
-            if (! lex->is_partition_management())
-            {
-              if (part_info->part_type != LIST_PARTITION)
+            if (part_info->part_type == NOT_A_PARTITION)
+              part_info->part_type= LIST_PARTITION;
+            else if (part_info->part_type != LIST_PARTITION)
             {
               my_error(ER_PARTITION_WRONG_VALUES_ERROR, MYF(0),
                        "LIST", "IN");
               MYSQL_YYABORT;
             }
           }
-            else
-              part_info->part_type= LIST_PARTITION;
-          }
           part_values_in {}
         ;