Bug#33222 - myisam-table drops rows when column is added

           and a char-field > 128 exists

CHECK TABLE (non-QUICK) and any form of repair table did wrongly rate
records as corrupted under the following conditions:
1. The table has dynamic row format and
2. it has a CHAR like column > 127 bytes (but not VARCHAR)
   (for multi-byte character sets this could be less than 127
   characters) and
3. it has records with > 127 bytes significant length in that column
   (a byte beyond byte position 127 must be non-space).
Affected were the statements CHECK TABLE, REPAIR TABLE, OPTIMIZE TABLE,
ALTER TABLE. CHECK TABLE reported and marked the table as crashed if any
record was present that fulfilled condition 3. The other statements
deleted these records.

The problem was a signed/unsigned compare in MyISAM code. A
char to uchar change became necessary after the big byte to uchar
change.


mysql-test/r/myisam.result:
  Bug#33222 - myisam-table drops rows when column is added
             and a char-field > 128 exists
  Added test result.
mysql-test/t/myisam.test:
  Bug#33222 - myisam-table drops rows when column is added
             and a char-field > 128 exists
  Added test.
storage/myisam/mi_dynrec.c:
  Bug#33222 - myisam-table drops rows when column is added
             and a char-field > 128 exists
  char -> uchar became necessary after big byte -> uchar change.
  Fixed some small coding style violations near the changes.

1 files changed, 162 insertions, 0 deletions

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