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plan select median( mpg ) from mtcars ;
+-----------------------------------------------------------------------------+
| rel |
+=============================================================================+
| project ( |
| | group by ( |
| | | table(sys.mtcars) [ mtcars.rownames, mtcars.mpg, mtcars.%TID% NOT NULL |
: ] COUNT :
| | ) [ ] [ sys.median no nil (mtcars.mpg) as L1 ] |
| ) [ L1 ] |
+-----------------------------------------------------------------------------+
5 tuples (0.660ms)
sql>
Expected Results:
returned the median() value for mpg column of the mtcars data table
Comment 18706
Date: 2013-05-02 21:31:14 +0200
From: Anthony Damico <>
sorry, should've included:
MonetDB 5 server v11.15.7 "Feb2013-SP2"
Serving database 'test', using 8 threads
Compiled for x86_64-pc-winnt/64bit with 64bit OIDs dynamically linked
Found 7.860 GiB available main-memory.
Copyright (c) 1993-July 2008 CWI.
Copyright (c) August 2008-2013 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/JAQL module loaded
MonetDB/SQL module loaded
Date: 2013-05-02 21:20:08 +0200
From: Anthony Damico <>
To: SQL devs <>
Version: 11.15.1 (Feb2013)
CC: ajdamico
Last updated: 2013-07-03 08:48:02 +0200
Comment 18705
Date: 2013-05-02 21:20:08 +0200
From: Anthony Damico <>
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0
Build Identifier:
avg(), sum(), min(), max() all work when a column contains some NULL values. median does not (at least not in the very simple example below)
Reproducible: Always
Steps to Reproduce:
Steps to Reproduce:
download a simple, reproducible data file
http://forge.scilab.org/index.php/p/rdataset/source/file/master/csv/datasets/mtcars.csv
run these commands
CREATE TABLE mtcars ( rownames VARCHAR(255) , mpg DOUBLE PRECISION , cyl DOUBLE PRECISION , disp DOUBLE PRECISION , hp DOUBLE PRECISION , drat DOUBLE PRECISION , wt DOUBLE PRECISION , qsec DOUBLE PRECISION , vs DOUBLE PRECISION , am DOUBLE PRECISION , gear DOUBLE PRECISION , carb DOUBLE PRECISION ) ;
COPY 33 offset 2 records into mtcars from 'c:\users\anthonyd.kff\desktop\mtcars.csv' USING DELIMITERS ',','\n','"' NULL as '' ;
UPDATE mtcars SET mpg = NULL WHERE cyl = 6 ;
select avg( mpg ) from mtcars ;
select sum( mpg ) , min( mpg ) , max( mpg ) from mtcars ;
select median( mpg ) from mtcars ;
b must be dense-headed
Actual Results:
explain select median( mpg ) from mtcars ;
+-------------------------------------------------------------------+
| mal |
+===================================================================+
| function user.s6_2{autoCommit=true}():void; |
| X_17 := nil:dbl; |
| barrier X_34 := language.dataflow(); |
| X_2 := sql.mvc(); |
| X_3:bat[:oid,:oid] := sql.tid(X_2,"sys","mtcars"); |
| X_6 := sql.bind(X_2,"sys","mtcars","mpg",0); |
| (X_9,r1_9) := sql.bind(X_2,"sys","mtcars","mpg",2); |
| X_12 := sql.bind(X_2,"sys","mtcars","mpg",1); |
| X_14 := sql.delta(X_6,X_9,r1_9,X_12); |
| X_15 := algebra.leftfetchjoin(X_3,X_14); |
| X_16 := algebra.selectNotNil(X_15); |
| X_17 := aggr.median(X_16); |
| exit X_34; |
| sql.exportValue(1,"sys.mtcars","L1","double",53,0,9,X_17,""); |
| end s6_2; |
+-------------------------------------------------------------------+
plan select median( mpg ) from mtcars ;
+-----------------------------------------------------------------------------+
| rel |
+=============================================================================+
| project ( |
| | group by ( |
| | | table(sys.mtcars) [ mtcars.rownames, mtcars.mpg, mtcars.%TID% NOT NULL |
: ] COUNT :
| | ) [ ] [ sys.median no nil (mtcars.mpg) as L1 ] |
| ) [ L1 ] |
+-----------------------------------------------------------------------------+
5 tuples (0.660ms)
sql>
Expected Results:
returned the median() value for mpg column of the mtcars data table
Comment 18706
Date: 2013-05-02 21:31:14 +0200
From: Anthony Damico <>
sorry, should've included:
MonetDB 5 server v11.15.7 "Feb2013-SP2"
Serving database 'test', using 8 threads
Compiled for x86_64-pc-winnt/64bit with 64bit OIDs dynamically linked
Found 7.860 GiB available main-memory.
Copyright (c) 1993-July 2008 CWI.
Copyright (c) August 2008-2013 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/JAQL module loaded
MonetDB/SQL module loaded
Comment 18708
Date: 2013-05-03 10:07:08 +0200
From: MonetDB Mercurial Repository <>
Changeset 0768b9f3fc76 made by Sjoerd Mullender sjoerd@acm.org in the MonetDB repo, refers to this bug.
For complete details, see http//devmonetdborg/hg/MonetDB?cmd=changeset;node=0768b9f3fc76
Changeset description:
Comment 18709
Date: 2013-05-03 10:07:56 +0200
From: @sjoerdmullender
Thanks for the report and the test.
The bug is fixed for the next release.
The text was updated successfully, but these errors were encountered: