>Description:
Requests are much longer when using IN instead of =, even
if the list specified after IN has only one element.
>How-To-Repeat:
create table tmp (a integer, b integer, c integer);
create index tmp_id on tmp (a,b,c);
insert into tmp values (1,2,3);
insert into tmp values (2,1,3);
explain select * from tmp where a=1 and b=2;
explain select * from tmp where a=1 and b in (2);
explain select * from tmp where a=1 and b=2 order by c;
explain select * from tmp where a=1 and b in (2) order by c;
>Fix:
>Submitter-Id: <submitter ID>
>Originator: Herve Guillemet
>Organization:
Apteryx
>MySQL support: none
>Synopsis: Bad use of index when using IN
>Severity: serious
>Priority: high
>Category: mysql
>Class: sw-bug
>Release: mysql-3.23.44 (Source distribution)
>Environment:
System: Linux rill 2.4.13 #2 Mon Oct 29 11:44:05 CET 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-slackware-linux/2.95.3/specs
gcc version 2.95.3 20010315 (release)
Compilation info: CC='gcc' CFLAGS='' CXX='c++' CXXFLAGS='' LDFLAGS=''
LIBC:
lrwxrwxrwx 1 root root 13 Oct 25 12:27 /lib/libc.so.6 -> libc-2.2.3.so
-rwxr-xr-x 1 root root 4783716 May 26 03:03 /lib/libc-2.2.3.so
-rw-r--r-- 1 root root 24721042 May 26 03:00 /usr/lib/libc.a
-rw-r--r-- 1 root root 178 May 26 03:00 /usr/lib/libc.so
Configure command: ./configure --prefix=/home/hg/mysqlsearch/mysql
--enable-thread-safe-client --with-mysqld-user=hg --with-mysqld-group=users
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