Hello Stefan,

Now I try:

mil>var yyy := [int]("1 2 3 4".split(" "));

mil>yyy.print(); #-----------------# # h t # name # void int # type #-----------------# [ nil, 1 ] [ nil, 2 ] [ nil, 3 ] [ nil, 4 ]

mil>(yyy [+] yyy).print(); #-----------------# # h t # name # void int # type #-----------------# [ nil, 2 ] [ nil, 4 ] [ nil, 6 ] [ nil, 8 ]

Would this be a bug then? I see an inconsistency with the [+] behaviour for strings.

Greetings, Peter.

Stefan Manegold wrote:

Peter,

the empty result is correct in this case: a multiplex does not match BUNs by position, but by an equi-join of the head columns. In your case the head column of the split-result is nil, and since nil never match with each other, the implicite equi-join result is empty, so is consequently the multiplex result. To get your desired result, you need to create a non-nil unique head column, e.g., via tmark() as shown below.

Stefan

======== $ Mserver --trace < /tmp/xxx.mil # Monet Database Server V4.11.3 # Copyright (c) 1993-2006, CWI. All rights reserved. # Compiled for x86_64-redhat-linux-gnu/64bit with 64bit OIDs; dynamically linked. # Visit http://monetdb.cwi.nl/ for further information. MonetDB>var xxx := "aap noot mies".split(" "); MonetDB>xxx.print(); #-----------------# # h t # name # void str # type #-----------------# [ nil, "aap" ] [ nil, "noot" ] [ nil, "mies" ] MonetDB>(xxx [+] xxx).print(); #-----------------# # h t # name # void str # type #-----------------# MonetDB> MonetDB>var yyy := "aap noot mies".split(" ").tmark(0@0); MonetDB>yyy.print(); #-----------------# # t h # name # void str # type #-----------------# [ 0@0, "aap" ] [ 1@0, "noot" ] [ 2@0, "mies" ] MonetDB>(yyy [+] yyy).print(); #-------------------------# # h t # name # void str # type #-------------------------# [ 0@0, "aapaap" ] [ 1@0, "nootnoot" ] [ 2@0, "miesmies" ] MonetDB>quit(); ========

On Thu, May 18, 2006 at 07:54:19PM +0200, Peter Roozemaal wrote:

...

I am using monetdb 4.10.2 on an AMD64 Gentoo Linux system (the Gentoo ebuild). I suspect there's a bug in the handling of the multiplex string-add:

The following mil code:

var xxx := "aap noot mies".split(" "); (xxx [+] xxx).print();

prints an empty BAT:

#-----------------# # h t # name # void str # type #-----------------#

where I expected: [ nil, "aapaap" ] [ nil, "nootnoot" ] [ nil, "miesmies" ]

It looks like every invocation of the string [+] gives an empty result.

Greetings, Peter Roozemaal.

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