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I am trying to evaluate the performance of MonetDB for an analytical workload.
I am using MonetDB-11.15.17 built from source on Ubuntu 13.04.
I have encountered a problem with user using defined functions in SQL which I have reduced to this test case.
I appears that whenever I have over 200,000 rows in the table, the UDF returns null.
First create a test data set with the following python:
import random
with open("test_data.csv","w") as f:
for i in range(0,1000000):
f.write("%s,%s\n" % (random.random(),random.random()))
Then I use the following to load the data, and try using a simple UDF in SQL.
CREATE TABLE TEST (
x float,
y float
);
COPY 200000 RECORDS INTO TEST from '/home/alastair/test_data.csv' USING DELIMITERS ',','\n','"' NULL AS '';
CREATE FUNCTION MY_UDF (x float, y float)
RETURNS float
BEGIN
DECLARE ret float;
set ret = LOG(x/y);
RETURN ret;
END;
SELECT 'udf alone',MY_UDF(0.1,0.2);
SELECT 'udf from table',MY_UDF(t.x,t.y) FROM TEST as t limit 1; -- this returns NULL with 200000 records
DROP FUNCTION MY_UDF;
DROP TABLE TEST;
The value returned my MY_UDF is null with 200,000 records, changing to 199,999 records in COPY INTO produces the correct result.
If I use a UDF built in C, the problem does not exist at all.
Reproducible: Always
Comment 19330
Date: 2013-11-13 16:27:43 +0100
From: @mlkersten
A condensed version of this bug has been added to the repository as BugTracker_2013/Tests/udf_error.Bug-3396
the 200.000 rows aren't needed to trigger the bug. Just setting the --forcemito
will do. This clearly points into the merge table direction. Its likely related to handling if/then else in the mergetable code.
fixed crash in BATappend (cannot use memcpy on void bat)
approved output
after addition of quantile aggregate
after readded groups optimizer
approved output for bug #3396 (fix came from merge with feb2013, proper handling of variable overwriting in mergetable optimizer)
Date: 2013-11-13 16:25:18 +0100
From: @mlkersten
To: SQL devs <>
Version: 11.15.11 (Feb2013-SP3)
CC: @njnes
Last updated: 2013-12-03 13:59:39 +0100
Comment 19329
Date: 2013-11-13 16:25:18 +0100
From: @mlkersten
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:24.0) Gecko/20100101 Firefox/24.0
Build Identifier:
a.mckinley@analyticsengines.com produced a bug report on the mailinglist.
Hi all,
I am trying to evaluate the performance of MonetDB for an analytical workload.
I am using MonetDB-11.15.17 built from source on Ubuntu 13.04.
I have encountered a problem with user using defined functions in SQL which I have reduced to this test case.
I appears that whenever I have over 200,000 rows in the table, the UDF returns null.
First create a test data set with the following python:
Then I use the following to load the data, and try using a simple UDF in SQL.
The value returned my MY_UDF is null with 200,000 records, changing to 199,999 records in COPY INTO produces the correct result.
If I use a UDF built in C, the problem does not exist at all.
Reproducible: Always
Comment 19330
Date: 2013-11-13 16:27:43 +0100
From: @mlkersten
A condensed version of this bug has been added to the repository as BugTracker_2013/Tests/udf_error.Bug-3396
Comment 19334
Date: 2013-11-14 15:29:08 +0100
From: @njnes
the 200.000 rows aren't needed to trigger the bug. Just setting the --forcemito
will do. This clearly points into the merge table direction. Its likely related to handling if/then else in the mergetable code.
Comment 19337
Date: 2013-11-15 15:50:38 +0100
From: MonetDB Mercurial Repository <>
Changeset 9aa381c5d6bf made by Niels Nes niels@cwi.nl in the MonetDB repo, refers to this bug.
For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=9aa381c5d6bf
Changeset description:
Comment 19341
Date: 2013-11-16 13:24:44 +0100
From: MonetDB Mercurial Repository <>
Changeset 045ed91ead43 made by Niels Nes niels@cwi.nl in the MonetDB repo, refers to this bug.
For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=045ed91ead43
Changeset description:
Comment 19386
Date: 2013-12-03 13:59:39 +0100
From: @sjoerdmullender
Feb2013-SP6 has been released.
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