diff --git a/mysql-test/r/myisam.result b/mysql-test/r/myisam.result
index 353d66b1ad5..62220de0496 100644
--- a/mysql-test/r/myisam.result
+++ b/mysql-test/r/myisam.result
@@ -2001,4 +2001,166 @@ CHECK TABLE t1;
 Table	Op	Msg_type	Msg_text
 test.t1	check	status	OK
 DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(130),
+c2 VARCHAR(1)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(REPEAT("a",128), 'b');
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+REPAIR TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(130),
+c2 VARCHAR(1)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(REPEAT("a",128), 'b');
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+REPAIR TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(130),
+c2 VARCHAR(1)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(REPEAT("a",128), 'b');
+INSERT INTO t1 VALUES('b', 'b');
+INSERT INTO t1 VALUES('c', 'b');
+DELETE FROM t1 WHERE c1='b';
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+2
+OPTIMIZE TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	optimize	status	OK
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+2
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(130),
+c2 VARCHAR(1),
+KEY (c1)
+) ENGINE=MyISAM;
+# Insert 100 rows. Query log disabled.
+UPDATE t1 SET c1=REPEAT("a",128) LIMIT 90;
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+100
+ALTER TABLE t1 ENGINE=MyISAM;
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+100
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+CHECK TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(50),
+c2 VARCHAR(1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+INSERT INTO t1 VALUES(REPEAT(_utf8 x'e0ae85',43), 'b');
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+REPAIR TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(50),
+c2 VARCHAR(1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+INSERT INTO t1 VALUES(REPEAT(_utf8 x'e0ae85',43), 'b');
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+REPAIR TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+1
+CHECK TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(50),
+c2 VARCHAR(1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+INSERT INTO t1 VALUES(REPEAT(_utf8 x'e0ae85',43), 'b');
+INSERT INTO t1 VALUES('b', 'b');
+INSERT INTO t1 VALUES('c', 'b');
+DELETE FROM t1 WHERE c1='b';
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+2
+OPTIMIZE TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	optimize	status	OK
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+2
+DROP TABLE t1;
+CREATE TABLE t1 (
+c1 CHAR(50),
+c2 VARCHAR(1),
+KEY (c1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+# Insert 100 rows. Query log disabled.
+UPDATE t1 SET c1=REPEAT(_utf8 x'e0ae85',43) LIMIT 90;
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+100
+ALTER TABLE t1 ENGINE=MyISAM;
+SELECT COUNT(*) FROM t1;
+COUNT(*)
+100
+CHECK TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+CHECK TABLE t1 EXTENDED;
+Table	Op	Msg_type	Msg_text
+test.t1	check	status	OK
+DROP TABLE t1;
 End of 5.1 tests
diff --git a/mysql-test/t/myisam.test b/mysql-test/t/myisam.test
index cadab8b3b70..334ecfd02d3 100644
--- a/mysql-test/t/myisam.test
+++ b/mysql-test/t/myisam.test
@@ -1261,5 +1261,175 @@ DELETE FROM t1 WHERE c1 >= 10;
 CHECK TABLE t1;
 DROP TABLE t1;
 
+#
+# Bug#33222 - myisam-table drops rows when column is added
+#             and a char-field > 128 exists
+#
+# Test #1 - CHECK TABLE sees wrong record, REPAR TABLE deletes it.
+# Using a CHAR column that can have > 127 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+CREATE TABLE t1 (
+  c1 CHAR(130),
+  c2 VARCHAR(1)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(REPEAT("a",128), 'b');
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1;
+REPAIR TABLE t1;
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1;
+DROP TABLE t1;
+#
+# Test #2 - same as test #1, but using EXTENDED.
+# Using a CHAR column that can have > 127 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+CREATE TABLE t1 (
+  c1 CHAR(130),
+  c2 VARCHAR(1)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(REPEAT("a",128), 'b');
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1 EXTENDED;
+REPAIR TABLE t1 EXTENDED;
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1 EXTENDED;
+DROP TABLE t1;
+#
+# Test #3 - same as test #1, but using OPTIMIZE TABLE.
+# Using a CHAR column that can have > 127 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+CREATE TABLE t1 (
+  c1 CHAR(130),
+  c2 VARCHAR(1)
+) ENGINE=MyISAM;
+INSERT INTO t1 VALUES(REPEAT("a",128), 'b');
+# Insert more rows and delete one in the middle to force optimize.
+INSERT INTO t1 VALUES('b', 'b');
+INSERT INTO t1 VALUES('c', 'b');
+DELETE FROM t1 WHERE c1='b';
+SELECT COUNT(*) FROM t1;
+OPTIMIZE TABLE t1;
+SELECT COUNT(*) FROM t1;
+DROP TABLE t1;
+#
+# Test #4 - ALTER TABLE deletes rows.
+# Using a CHAR column that can have > 127 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+# Using an index which can be disabled during bulk insert.
+CREATE TABLE t1 (
+  c1 CHAR(130),
+  c2 VARCHAR(1),
+  KEY (c1)
+) ENGINE=MyISAM;
+#
+# Insert 100 rows. This turns bulk insert on during the copy phase of
+# ALTER TABLE. Bulk insert disables keys before the insert and re-enables
+# them by repair after the insert.
+--disable_query_log
+let $count= 100;
+--echo # Insert $count rows. Query log disabled.
+while ($count)
+{
+  INSERT INTO t1 VALUES ('a', 'b');
+  dec $count;
+}
+--enable_query_log
+#
+# Change most of the rows into long character values with > 127 characters.
+UPDATE t1 SET c1=REPEAT("a",128) LIMIT 90;
+SELECT COUNT(*) FROM t1;
+ALTER TABLE t1 ENGINE=MyISAM;
+#
+# With bug present, this shows that all long rows are gone.
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1;
+CHECK TABLE t1 EXTENDED;
+DROP TABLE t1;
+#
+# Test #5 - same as test #1 but UTF-8.
+# Using a CHAR column that can have > 127 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+CREATE TABLE t1 (
+  c1 CHAR(50),
+  c2 VARCHAR(1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+# Using Tamil Letter A, Unicode U+0B85
+INSERT INTO t1 VALUES(REPEAT(_utf8 x'e0ae85',43), 'b');
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1;
+REPAIR TABLE t1;
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1;
+DROP TABLE t1;
+#
+# Test #6 - same as test #2, but UTF-8.
+# Using a CHAR column that can have > 127 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+CREATE TABLE t1 (
+  c1 CHAR(50),
+  c2 VARCHAR(1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+# Using Tamil Letter A, Unicode U+0B85
+INSERT INTO t1 VALUES(REPEAT(_utf8 x'e0ae85',43), 'b');
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1 EXTENDED;
+REPAIR TABLE t1 EXTENDED;
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1 EXTENDED;
+DROP TABLE t1;
+#
+# Test #7 - same as test #3, but UTF-8.
+# Using a CHAR column that can have > 127 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+CREATE TABLE t1 (
+  c1 CHAR(50),
+  c2 VARCHAR(1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+# Using Tamil Letter A, Unicode U+0B85
+INSERT INTO t1 VALUES(REPEAT(_utf8 x'e0ae85',43), 'b');
+# Insert more rows and delete one in the middle to force optimize.
+INSERT INTO t1 VALUES('b', 'b');
+INSERT INTO t1 VALUES('c', 'b');
+DELETE FROM t1 WHERE c1='b';
+SELECT COUNT(*) FROM t1;
+OPTIMIZE TABLE t1;
+SELECT COUNT(*) FROM t1;
+DROP TABLE t1;
+#
+# Test #8 - same as test #4, but UTF-8.
+# Using a CHAR column that can have > 42 UTF-8 characters.
+# Using a VARCHAR to create a table with dynamic row format.
+# Using an index which can be disabled during bulk insert.
+CREATE TABLE t1 (
+  c1 CHAR(50),
+  c2 VARCHAR(1),
+  KEY (c1)
+) ENGINE=MyISAM DEFAULT CHARSET UTF8;
+#
+# Insert 100 rows. This turns bulk insert on during the copy phase of
+# ALTER TABLE. Bulk insert disables keys before the insert and re-enables
+# them by repair after the insert.
+--disable_query_log
+let $count= 100;
+--echo # Insert $count rows. Query log disabled.
+while ($count)
+{
+  INSERT INTO t1 VALUES ('a', 'b');
+  dec $count;
+}
+--enable_query_log
+#
+# Change most of the rows into long character values with > 42 characters.
+# Using Tamil Letter A, Unicode U+0B85
+UPDATE t1 SET c1=REPEAT(_utf8 x'e0ae85',43) LIMIT 90;
+SELECT COUNT(*) FROM t1;
+ALTER TABLE t1 ENGINE=MyISAM;
+#
+# With bug present, this shows that all long rows are gone.
+SELECT COUNT(*) FROM t1;
+CHECK TABLE t1;
+CHECK TABLE t1 EXTENDED;
+DROP TABLE t1;
+
 --echo End of 5.1 tests
 
diff --git a/storage/myisam/mi_dynrec.c b/storage/myisam/mi_dynrec.c
index 9940cf62204..22fa3d18802 100644
--- a/storage/myisam/mi_dynrec.c
+++ b/storage/myisam/mi_dynrec.c
@@ -1006,12 +1006,12 @@ uint _mi_rec_pack(MI_INFO *info, register uchar *to,
 	{
 	  if (rec->length > 255 && new_length > 127)
 	  {
-	    to[0]=(char) ((new_length & 127)+128);
-	    to[1]=(char) (new_length >> 7);
-	    to+=2;
-	  }
-	  else
-	    *to++= (char) new_length;
+            to[0]= (uchar) ((new_length & 127) + 128);
+            to[1]= (uchar) (new_length >> 7);
+            to+=2;
+          }
+          else
+            *to++= (uchar) new_length;
 	  memcpy((uchar*) to,pos,(size_t) new_length); to+=new_length;
 	  flag|=bit;
 	}
@@ -1045,7 +1045,7 @@ uint _mi_rec_pack(MI_INFO *info, register uchar *to,
       }
       if ((bit= bit << 1) >= 256)
       {
-	*packpos++ = (char) (uchar) flag;
+        *packpos++= (uchar) flag;
 	bit=1; flag=0;
       }
     }
@@ -1055,9 +1055,9 @@ uint _mi_rec_pack(MI_INFO *info, register uchar *to,
     }
   }
   if (bit != 1)
-    *packpos= (char) (uchar) flag;
+    *packpos= (uchar) flag;
   if (info->s->calc_checksum)
-    *to++=(char) info->checksum;
+    *to++= (uchar) info->checksum;
   DBUG_PRINT("exit",("packed length: %d",(int) (to-startpos)));
   DBUG_RETURN((uint) (to-startpos));
 } /* _mi_rec_pack */
@@ -1128,12 +1128,14 @@ my_bool _mi_rec_check(MI_INFO *info,const uchar *record, uchar *rec_buff,
 	    goto err;
 	  if (rec->length > 255 && new_length > 127)
 	  {
-	    if (to[0] != (char) ((new_length & 127)+128) ||
-		to[1] != (char) (new_length >> 7))
-	      goto err;
-	    to+=2;
-	  }
-	  else if (*to++ != (char) new_length)
+            /* purecov: begin inspected */
+            if (to[0] != (uchar) ((new_length & 127) + 128) ||
+                to[1] != (uchar) (new_length >> 7))
+              goto err;
+            to+=2;
+            /* purecov: end */
+          }
+          else if (*to++ != (uchar) new_length)
 	    goto err;
 	  to+=new_length;
 	}