[ monetdb-Bugs-2019349 ] assert fails on algebra version

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Bugs item #2019349, was opened at 2008-07-16 09:52
Message generated for change (Comment added) made by nielsnes
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Category: SQL/Core
Group: SQL CVS Head
Status: Open
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Romulo Goncalves (romulog)
Assigned to: Niels Nes (nielsnes)
Summary: assert fails on algebra version

Initial Comment:
This bug only occurs in the current branch and for mclient -G.

If you run the following sql code you will crash mserver:
create table prop1 (subj int, obj int, prop int);
create table prop2 (subj int, obj int, prop int);


explain WITH A(subj, obj) as (SELECT * FROM prop1 where obj = 14660332)
SELECT prop, obj, cnt from (
                ( SELECT 'prop14657240_pso' as prop, B.obj, count(*) as cnt
                        FROM A, prop2 as B
                        WHERE A.subj = B.subj
                        GROUP BY B.obj HAVING count(*) > 1
                )
 ) as trip;

drop table prop1;
drop table prop2;


Some debug information:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1107310928 (LWP 32432)]
0x00002aaabe74dddc in sql_ref_dec (r=0x21)
    at /ufs/goncalve/MonetDB/current/sql/src/common/sql_mem.mx:50
50              assert(r->refcnt > 0);
Missing separate debuginfos, use: debuginfo-install bzip2.x86_64 e2fsprogs.x86_64 glibc.x86_64 keyutils.x86_64 krb5.x86_64 libselinux.x86_64 ncurses.x86_64 openssl.x86_64 pcre.x86_64 readline.x86_64 zlib.x86_64
(gdb) up
#1  0x00002aaabe6bf89e in stmt_destroy (s=0x21)
    at /ufs/goncalve/MonetDB/current/sql/src/server/sql_statement.mx:634
634             if (sql_ref_dec(&s->ref) == 0) {
(gdb) up
#2  0x00002aaabe6bfd23 in stmt_destroy (s=0xde9db8)
    at /ufs/goncalve/MonetDB/current/sql/src/server/sql_statement.mx:810
810                             stmt_destroy(s->t);
(gdb) bt


----------------------------------------------------------------------

>Comment By: Niels Nes (nielsnes)
Date: 2008-07-21 07:51

Message:
Logged In: YES
user_id=43556
Originator: NO

fixed in stable. Incorrectly used stmt_destroy (exp's != stmt). Also we
now return an error on not matching column lists.

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