GNU bug report logs - #9325
document that "all bets are off if the file contains non-unique join fields"

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: jidanni <at> jidanni.org
To: bug-coreutils <at> gnu.org
Subject: document that "all bets are off if the file contains non-unique join
	fields"
Date: Fri, 19 Aug 2011 04:29:32 +0800

Mention in the join(1) documents that "all bets are off if the file
contains non-unique join fields", e.g.,
a
b
b
c
Also mention if you get this email.

Message #8 received at 9325 <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: jidanni <at> jidanni.org
Cc: 9325 <at> debbugs.gnu.org
Subject: Re: bug#9325: document that "all bets are off if the file contains
	non-unique join fields"
Date: Fri, 19 Aug 2011 11:23:45 +0200

jidanni <at> jidanni.org wrote:
> Mention in the join(1) documents that "all bets are off if the file
> contains non-unique join fields", e.g.,
> a
> b
> b
> c
> Also mention if you get this email.

Thanks for the suggestion.
Would you please suggest wording and where to put it?
(gasp! a patch ;-)

Message #13 received at 9325-done <at> debbugs.gnu.org (full text, mbox):

From: Pádraig Brady <P <at> draigBrady.com>
To: jidanni <at> jidanni.org
Cc: 9325-done <at> debbugs.gnu.org
Subject: Re: bug#9325: document that "all bets are off if the file contains
	non-unique join fields"
Date: Fri, 19 Aug 2011 11:16:13 +0100

On 08/18/2011 09:29 PM, jidanni <at> jidanni.org wrote:
> Mention in the join(1) documents that "all bets are off if the file
> contains non-unique join fields", e.g.,
> a
> b
> b
> c
> Also mention if you get this email.

non unique fields are supported

$ join <(printf "%s\n" 'a 1' 'b 2' 'b 3' 'c 4') <(printf "%s\n" a b c)
a 1
b 2
b 3
c 4

cheers,
Pádraig.

Message #16 received at 9325 <at> debbugs.gnu.org (full text, mbox):

From: jidanni <at> jidanni.org
To: 9325 <at> debbugs.gnu.org
Subject: Re: bug#9325: closed (Re: bug#9325: document that "all bets are off
	if the file contains non-unique join fields")
Date: Fri, 19 Aug 2011 19:46:29 +0800

OK, glad to know they are supported. Indeed,

$ join <(printf "%s\n" 'a 1' 'b 2' 'b 3' 'c 4') <(printf "%s\n" a b 'b 5' c c)
a 1
b 2
b 2 5
b 3
b 3 5
c 4
c 4

So be sure to mention it wherever you mention files must be in sorted
order.

I mean probably if you don't mention it, nobody will be sure what the
behavior will be.

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