MDEV-6390 CONVERT TO CHARACTER SET utf8 doesn't change DEFAULT CHARSET.

        ALTER_CONVERT flag removed and replaced for ALTER_OPTIONS
        for the CONVERT TO CHARACTER SET command.

mysql-test/r/alter_table.result

@@ -2091,3 +2091,24 @@ Warnings:
 Note	1061	Duplicate key name 'id1'
 DROP TABLE t2;
 DROP TABLE t1;
+#
+# MDEV-6390 CONVERT TO CHARACTER SET utf8 doesn't change DEFAULT CHARSET.
+#
+CREATE TABLE t1 (id int(11) NOT NULL, a int(11) NOT NULL, b int(11))
+ENGINE=InnoDB DEFAULT CHARSET=latin1;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL,
+  `a` int(11) NOT NULL,
+  `b` int(11) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+ALTER TABLE t1 CONVERT TO CHARACTER SET utf8;
+SHOW CREATE TABLE t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) NOT NULL,
+  `a` int(11) NOT NULL,
+  `b` int(11) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8
+DROP TABLE t1;

mysql-test/t/alter_table.test

@@ -1756,3 +1756,14 @@ REFERENCES t1 (id);
 DROP TABLE t2;
 DROP TABLE t1;
 
+
+--echo #
+--echo # MDEV-6390 CONVERT TO CHARACTER SET utf8 doesn't change DEFAULT CHARSET.
+--echo #
+
+CREATE TABLE t1 (id int(11) NOT NULL, a int(11) NOT NULL, b int(11))
+  ENGINE=InnoDB DEFAULT CHARSET=latin1;
+SHOW CREATE TABLE t1;
+ALTER TABLE t1 CONVERT TO CHARACTER SET utf8;
+SHOW CREATE TABLE t1;
+DROP TABLE t1;

sql/sql_alter.h

@@ -70,59 +70,56 @@ class Alter_info
   // Set for DISABLE KEYS | ENABLE KEYS
   static const uint ALTER_KEYS_ONOFF            = 1L <<  9;
 
-  // Set for CONVERT TO CHARACTER SET
-  static const uint ALTER_CONVERT               = 1L << 10;
-
   // Set for FORCE
   // Set for ENGINE(same engine)
   // Set by mysql_recreate_table()
-  static const uint ALTER_RECREATE              = 1L << 11;
+  static const uint ALTER_RECREATE              = 1L << 10;
 
   // Set for ADD PARTITION
-  static const uint ALTER_ADD_PARTITION         = 1L << 12;
+  static const uint ALTER_ADD_PARTITION         = 1L << 11;
 
   // Set for DROP PARTITION
-  static const uint ALTER_DROP_PARTITION        = 1L << 13;
+  static const uint ALTER_DROP_PARTITION        = 1L << 12;
 
   // Set for COALESCE PARTITION
-  static const uint ALTER_COALESCE_PARTITION    = 1L << 14;
+  static const uint ALTER_COALESCE_PARTITION    = 1L << 13;
 
   // Set for REORGANIZE PARTITION ... INTO
-  static const uint ALTER_REORGANIZE_PARTITION  = 1L << 15;
+  static const uint ALTER_REORGANIZE_PARTITION  = 1L << 14;
 
   // Set for partition_options
-  static const uint ALTER_PARTITION             = 1L << 16;
+  static const uint ALTER_PARTITION             = 1L << 15;
 
   // Set for LOAD INDEX INTO CACHE ... PARTITION
   // Set for CACHE INDEX ... PARTITION
-  static const uint ALTER_ADMIN_PARTITION       = 1L << 17;
+  static const uint ALTER_ADMIN_PARTITION       = 1L << 16;
 
   // Set for REORGANIZE PARTITION
-  static const uint ALTER_TABLE_REORG           = 1L << 18;
+  static const uint ALTER_TABLE_REORG           = 1L << 17;
 
   // Set for REBUILD PARTITION
-  static const uint ALTER_REBUILD_PARTITION     = 1L << 19;
+  static const uint ALTER_REBUILD_PARTITION     = 1L << 18;
 
   // Set for partitioning operations specifying ALL keyword
-  static const uint ALTER_ALL_PARTITION         = 1L << 20;
+  static const uint ALTER_ALL_PARTITION         = 1L << 19;
 
   // Set for REMOVE PARTITIONING
-  static const uint ALTER_REMOVE_PARTITIONING   = 1L << 21;
+  static const uint ALTER_REMOVE_PARTITIONING   = 1L << 20;
 
   // Set for ADD FOREIGN KEY
-  static const uint ADD_FOREIGN_KEY             = 1L << 22;
+  static const uint ADD_FOREIGN_KEY             = 1L << 21;
 
   // Set for DROP FOREIGN KEY
-  static const uint DROP_FOREIGN_KEY            = 1L << 23;
+  static const uint DROP_FOREIGN_KEY            = 1L << 22;
 
   // Set for EXCHANGE PARITION
-  static const uint ALTER_EXCHANGE_PARTITION    = 1L << 24;
+  static const uint ALTER_EXCHANGE_PARTITION    = 1L << 23;
 
   // Set by Sql_cmd_alter_table_truncate_partition::execute()
-  static const uint ALTER_TRUNCATE_PARTITION    = 1L << 25;
+  static const uint ALTER_TRUNCATE_PARTITION    = 1L << 24;
 
   // Set for ADD [COLUMN] FIRST | AFTER
-  static const uint ALTER_COLUMN_ORDER          = 1L << 26;
+  static const uint ALTER_COLUMN_ORDER          = 1L << 25;
 
 
   enum enum_enable_or_disable { LEAVE_AS_IS, ENABLE, DISABLE };

sql/sql_yacc.yy

@@ -7643,7 +7643,7 @@ alter_list_item:
             LEX *lex= Lex;
             if (lex->create_info.add_alter_list_item_convert_to_charset($5))
               MYSQL_YYABORT;
-            lex->alter_info.flags|= Alter_info::ALTER_CONVERT;
+            lex->alter_info.flags|= Alter_info::ALTER_OPTIONS;
           }
         | create_table_options_space_separated
           {