>Description:
Executing a SELECT DISTINCT statement in conjunction
with the BINARY cast operator will crash MySQL server
when the column being cast contains one or more null
values.
>How-To-Repeat:
Executing the following code from a mysql prompt will
cause the MySQL server to crash and restart.
create temporary table wassup (
rowid int not null AUTO_INCREMENT PRIMARY KEY,
col1 varchar(10) null
)
;
insert into wassup
(col1)
values
('aaa'),
('AAA'),
(NULL)
;
select distinct binary col1 from wassup
;
>Fix:
Work-arounds: Defining the column as binary during the create
table statement alleviates the need for the binary cast during
selects, and thereby eliminates the crashes. Alternatively,
adding "where col1 is not null" to the select statement
will also work.
>Submitter-Id: <submitter ID>
>Originator: Steve Severance
>Organization:
>MySQL support: none
>Synopsis: SELECT DISTINCT BINARY crashes mysql on null values
>Severity: non-critical
>Priority: low
>Category: mysql
>Class: sw-bug
>Release: mysql-3.23.47 (Official MySQL RPM)
>Environment:
System: Linux vexweb1 2.4.2-2smp #1 SMP Sun Apr 8 20:21:34 EDT 2001 i686 unknown
Architecture: i686
Some paths: /usr/bin/perl /usr/bin/make /usr/bin/gmake /usr/bin/gcc /usr/bin/cc
GCC: Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/2.96/specs
gcc version 2.96 20000731 (Red Hat Linux 7.1 2.96-81)
Compilation info: CC='gcc' CFLAGS='-O6 -fno-omit-frame-pointer -mpentium' CXX='gcc'
CXXFLAGS='-O6 -fno-omit-frame-pointer -felide-constructors
-fno-exceptions -fno-rtti -mpentium' LDFLAGS=''
LIBC:
lrwxrwxrwx 1 root root 13 Jan 4 16:56 /lib/libc.so.6 -> libc-2.2.2.so
-rwxr-xr-x 1 root root 1236396 Apr 6 2001 /lib/libc-2.2.2.so
-rw-r--r-- 1 root root 26350254 Apr 6 2001 /usr/lib/libc.a
-rw-r--r-- 1 root root 178 Apr 6 2001 /usr/lib/libc.so
Configure command: ./configure --disable-shared --with-mysqld-ldflags=-all-static
--with-client-ldflags=-all-static --without-berkeley-db --without-innodb
--enable-assembler --with-mysqld-user=mysql
--with-unix-socket-path=/var/lib/mysql/mysql.sock --prefix=/
--with-extra-charsets=complex --exec-prefix=/usr --libexecdir=/usr/sbin
--sysconfdir=/etc --datadir=/usr/share --localstatedir=/var/lib/mysql
--infodir=/usr/info --includedir=/usr/include --mandir=/usr/man
'--with-comment=Official MySQL RPM'
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