alter table my_merge_table drop table t1; crashes mserver5 with Segmentation fault

[monetdb-team]

Date: 2015-04-23 16:01:57 +0200
From: Martin van Dinther <<martin.van.dinther>>
To: SQL devs <>
Version: 11.19.9 (Oct2014-SP2)
CC: @njnes

Last updated: 2015-08-28 13:43:03 +0200

Comment 20836

Date: 2015-04-23 16:01:57 +0200
From: Martin van Dinther <<martin.van.dinther>>

User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0
Build Identifier:

SQL "alter table m drop table t1;"
where table t1 does no longer exist (as it is dropped before) causes a segmentation fault. Instead it should return an error.

Also it appears that running "alter table m drop table t1;" twice is also accepted without a warning or error. I would like to receive an error instead.

Reproducible: Always

Steps to Reproduce:

1. start mserver5 (MonetDB 5 server v11.19.9 "Oct2014-SP2")
2. start mclient
3. execute SQL commands:
   create table t1 (i int);
   create table t2 (i int);
   create merge table m (i int);
   alter table m add table t1;
   alter table m add table t2;
   alter table m drop table t1;
   alter table m drop table t1;
   DROP table t1;
   alter table m drop table t1;
   -- this last alter table m statement causes the segmentation fault
   -- if it doesn't try also:
   select * from m;

Actual Results:

builtin opt gdk_dbpath = /export/scratch1/dinther/Downloads/INSTALL/var/monetdb5/dbfarm/demo
builtin opt gdk_debug = 0
builtin opt gdk_vmtrim = no
builtin opt monet_prompt = >
builtin opt monet_daemon = no
builtin opt mapi_port = 50000
builtin opt mapi_open = false
builtin opt mapi_autosense = false
builtin opt sql_optimizer = default_pipe
builtin opt sql_debug = 0
cmdline opt gdk_debug = 10
MonetDB 5 server v11.19.9 "Oct2014-SP2"
Serving database 'demo', using 8 threads
Compiled for x86_64-unknown-linux-gnu/64bit with 64bit OIDs dynamically linked
Found 15.590 GiB available main-memory.
Copyright (c) 1993-July 2008 CWI.
Copyright (c) August 2008-2015 MonetDB B.V., all rights reserved
Visit http://www.monetdb.org/ for further information
Listening for connection requests on mapi:monetdb://127.0.0.1:50000/
MonetDB/GIS module loaded
MonetDB/SQL module loaded

SQL catalog created, loading sql scripts once
loading sql script: 09_like.sql
loading sql script: 10_math.sql
loading sql script: 11_times.sql
loading sql script: 12_url.sql
loading sql script: 13_date.sql
loading sql script: 14_inet.sql
loading sql script: 15_querylog.sql
loading sql script: 16_tracelog.sql
loading sql script: 19_cluster.sql
loading sql script: 20_vacuum.sql
loading sql script: 21_dependency_functions.sql
loading sql script: 22_clients.sql
loading sql script: 23_skyserver.sql
loading sql script: 24_zorder.sql
loading sql script: 25_debug.sql
loading sql script: 26_sysmon.sql
loading sql script: 39_analytics.sql
loading sql script: 40_geom.sql
loading sql script: 40_json.sql
loading sql script: 41_jsonstore.sql
loading sql script: 45_uuid.sql
loading sql script: 46_gsl.sql
loading sql script: 75_storagemodel.sql
loading sql script: 80_statistics.sql
loading sql script: 80_udf.sql
loading sql script: 85_bam.sql
loading sql script: 90_generator.sql
loading sql script: 99_system.sql
./start_mserver5.sh: line 5: 11423 Segmentation fault

bash-4.2$ mclient
Welcome to mclient, the MonetDB/SQL interactive terminal (unreleased)
Database: MonetDB v11.19.9 (Oct2014-SP2), 'demo'
Type \q to quit, ? for a list of available commands
auto commit mode: on
sql>create table t1 (i int);
operation successful (1.612ms)
sql>create table t2 (i int);
operation successful (1.145ms)
sql>create merge table m (i int);
operation successful (0.716ms)
sql>alter table m add table t1;
operation successful (0.526ms)
sql>alter table m add table t2;
operation successful (0.471ms)
sql>alter table m drop table t1;
operation successful (0.180ms)
sql>alter table m drop table t1;
operation successful (0.672ms)
sql>alter table m drop table t1;
operation successful (0.620ms)
sql>DROP table t1;
operation successful (6.437ms)
sql>DROP table t1;
DROP TABLE: no such table 't1'
sql>alter table m drop table t1;
operation successful (0.612ms)
sql>alter table m drop table t1;
sql>
bash-4.2$

Expected Results:

after the SQLs:
alter table m add table t2;
alter table m drop table t1;
alter table m drop table t1;
I expect to get an error msg stating that table t1 cannot be dropped from merge table m as it is not part of the merge table definition.

after the SQLs:
DROP table t1;
alter table m drop table t1;
I expect to get an error msg stating that table t1 does not exist.

See also bug #3703

Comment 20842

Date: 2015-04-24 13:16:29 +0200
From: @njnes

fixed in default, also added a test to the mergetable set

Comment 21229

Date: 2015-08-28 13:43:03 +0200
From: @sjoerdmullender

Jul2015 has been released.