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MonetDB completely giving up on certain queries - no error and no result #6201

monetdb-team opened this issue Nov 30, 2020 · 0 comments


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@monetdb-team monetdb-team commented Nov 30, 2020

Date: 2017-02-02 15:32:48 +0100
From: @eyalroz
To: SQL devs <>
Version: 11.25.5 (Dec2016-SP1)
CC: @kutsurak, martin.van.dinther, @njnes

Last updated: 2017-03-03 10:24:32 +0100

Comment 24948

Date: 2017-02-02 15:32:48 +0100
From: @eyalroz

User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:51.0) Gecko/20100101 Firefox/51.0
Build Identifier:

Starting mclient with any database, and executing:

create table t1 (c1 integer);
insert into t1 values (1);
select sum(c2) from (select count() / (select count() from t1) as c2 from t1) as t;

should yield a single value, of 1. Instead - you get nothing, just a prompt for the next statement. No error message, no result, nothing in merovingian.log .

Seeing this also with 11.23.7 .

Reproducible: Always

Comment 24950

Date: 2017-02-02 15:42:28 +0100
From: @kutsurak

This actually crashes the server:

mserver5: /home/kutsurak/work/monet/sources/MonetDB/monetdb5/optimizer/opt_garbageCollector.c:102: OPTgarbageCollectorImplementation: Assertion `p->token == ENDsymbol' failed.

Comment 24952

Date: 2017-02-02 16:21:23 +0100
From: Martin van Dinther <<martin.van.dinther>>

I am also getting an assertion failure but a different one:

could not find L7.L6
mserver5: ../../../../dev/sql/backends/monet5/rel_bin.c:2404: rel2bin_project: Assertion `0' failed.

This is when using the latest Dec2016 source code (pulled at 2 febr 12:30).

Comment 24957

Date: 2017-02-02 22:54:32 +0100
From: @njnes

fixed (removed incorrect rewrite in the semantic phase)

Comment 24958

Date: 2017-02-02 23:05:35 +0100
From: MonetDB Mercurial Repository <>

Changeset d4b01e89ac7a made by Niels Nes in the MonetDB repo, refers to this bug.

For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=d4b01e89ac7a

Changeset description:

fixed bug #6201, ie handle group by in selection properly

Comment 25120

Date: 2017-03-03 10:24:32 +0100
From: @sjoerdmullender

Dec2016-SP2 has been released, incorporating the fix.

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