Обсуждение: WITH support
Hello, What is the status of supporting the "WITH" keyword? -- Edwin S. Ramirez, Senior Developer Information Technology Department - ITDC Mount Sinai Medical Center edwin.ramirez@mssm.edu * 646-217-3112
Edwin Ramirez wrote: > Hello, > > What is the status of supporting the "WITH" keyword? I see these TODO items: * Add SQL99 WITH clause to SELECT* Add SQL:2003 WITH RECURSIVE (hierarchical) queries to SELECT Are they the same item? Someone has said they will do RECURSIVE for 8.3, but there is no guarantee. -- Bruce Momjian bruce@momjian.us EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. +
Hello,<br /><br /> I can see : WITH RECURSIVE hierarchical queries (Jonah H. Harris) in :<br /><br /><a href="http://developer.postgresql.org/index.php/Todo:WishlistFor83">http://developer.postgresql.org/index.php/Todo:WishlistFor83</a><br /><br/> GREAT!!! <br /><br /> Such feature is very important, because it is supported in most of commercial database<br />SQL Server 2003 support WITH RECURSIVE<br /> DB2 support it too (WITH RECURSIVE has been invented by IBM)<br /> Oraclesupport CONNECT BY (which is not standard, but very easier to use compare to WITH RECURSIVE)<br /><br /> PostGreSQLwould be the first opensource database supporting hierarchical queries...<br /><br /> Today we use the "CONNECTBY" patch made by <font size="1">evgen potemkin</font> <a href="http://gppl.moonbone.ru/,">http://gppl.moonbone.ru/,</a>it works well on 8.1...<br /> But we are ready to drop it ifWITH RECURSIVE is integrated!!!<br /><br /> It would be great to open a page on the developper wiki on this subject?<br/><br /> Sincerely<br /><br /> Hubert FONGARNAND<br /><br /><table cellpadding="0" cellspacing="0" width="100%"><tr><td><pre>______ _ _ _ ____ _ __ __ _ | ___(_) __| |_ _ ___(_) __ _| | / ___|| |_ __ _ / _|/ _(_)_ __ __ _ | |_ | |/ _` | | | |/ __| |/ _` | | \___ \| __/ _` | |_| |_| | '_ \ / _` | | _| | | (_| | |_| | (__| | (_| | | ___) | || (_| | _| _| | | | | (_| | |_| |_|\__,_|\__,_|\___|_|\__,_|_| |____/ \__\__,_|_| |_| |_|_| |_|\__, | |___/ </pre><br /></td></tr></table><br /><br /> Le jeudi 28 décembre 2006 à 22:52 -0500, Bruce Momjian a écrit : <blockquote type="CITE"><pre> <font color="#000000">Edwin Ramirez wrote:</font> <font color="#000000">> Hello,</font> <font color="#000000">> </font> <font color="#000000">> What is the status of supporting the "WITH" keyword?</font> <font color="#000000">I see these TODO items:</font> <font color="#000000"> * Add SQL99 WITH clause to SELECT</font> <font color="#000000"> * Add SQL:2003 WITH RECURSIVE (hierarchical) queries to SELECT</font> <font color="#000000">Are they the same item? Someone has said they will do RECURSIVE for</font> <font color="#000000">8.3, but there is no guarantee.</font> <table cellpadding="0" cellspacing="0" width="100%"> <tr> <td> <br /> <br /> </td> </tr> </table> </pre></blockquote> _______________________________________________<br />Ce message et les �ventuels documents joints peuventcontenir des informations confidentielles.<br />Au cas o� il ne vous serait pas destin�, nous vous remercions de bienvouloir le supprimer et en aviser imm�diatement l'exp�diteur. Toute utilisation de ce message non conforme � sa destination,toute diffusion ou publication, totale ou partielle et quel qu'en soit le moyen est formellement interdite.<br/>Les communications sur internet n'�tant pas s�curis�es, l'int�grit� de ce message n'est pas assur�e et lasoci�t� �mettrice ne peut �tre tenue pour responsable de son contenu.
On Thu, Dec 28, 2006 at 10:52:45PM -0500, Bruce Momjian wrote: > Edwin Ramirez wrote: > > Hello, > > > > What is the status of supporting the "WITH" keyword? > > I see these TODO items: > > * Add SQL99 WITH clause to SELECT > * Add SQL:2003 WITH RECURSIVE (hierarchical) queries to SELECT > > Are they the same item? Not exactly. There is a WITH in the SQL:2003 spec (T121 and T122) which doesn't include RECURSIVE, but they're related to the RECURSIVE one (T131). > Someone has said they will do RECURSIVE for 8.3, but there is no > guarantee. Is there code for this yet? Who's the someone? :) Cheers, D -- David Fetter <david@fetter.org> http://fetter.org/ phone: +1 415 235 3778 AIM: dfetter666 Skype: davidfetter Remember to vote!
David Fetter wrote: > On Thu, Dec 28, 2006 at 10:52:45PM -0500, Bruce Momjian wrote: > > Edwin Ramirez wrote: > > > Hello, > > > > > > What is the status of supporting the "WITH" keyword? > > > > I see these TODO items: > > > > * Add SQL99 WITH clause to SELECT > > * Add SQL:2003 WITH RECURSIVE (hierarchical) queries to SELECT > > > > Are they the same item? > > Not exactly. There is a WITH in the SQL:2003 spec (T121 and T122) > which doesn't include RECURSIVE, but they're related to the RECURSIVE > one (T131). > > > Someone has said they will do RECURSIVE for 8.3, but there is no > > guarantee. > > Is there code for this yet? Who's the someone? :) No code yet, and I don't remember who said they were working on it. -- Bruce Momjian bruce@momjian.us EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. +
On 12/29/06, Bruce Momjian <bruce@momjian.us> wrote: > No code yet, and I don't remember who said they were working on it. I'm still waiting to hear from Mark Cave-Ayland on whether he's going to pick it up or whether I'll just do it. One way or another, there should be some movement regarding design discussion within a week or two. -- Jonah H. Harris, Software Architect | phone: 732.331.1324 EnterpriseDB Corporation | fax: 732.331.1301 33 Wood Ave S, 3rd Floor | jharris@enterprisedb.com Iselin, New Jersey 08830 | http://www.enterprisedb.com/
On Sat, 2006-12-30 at 00:49 -0500, Jonah H. Harris wrote: > On 12/29/06, Bruce Momjian <bruce@momjian.us> wrote: > > No code yet, and I don't remember who said they were working on it. > > I'm still waiting to hear from Mark Cave-Ayland on whether he's going > to pick it up or whether I'll just do it. One way or another, there > should be some movement regarding design discussion within a week or > two. Hi everyone, Sorry to come in late on this discussion - I've been playing catch-up with emails over the festive season... The situation regarding WITH support is that it's something which I am picking up in my spare time (out of work hours) and so unfortunately progress isn't as rapid as I would like. See here for my last meaningful patch and Tom's feedback: http://archives.postgresql.org/pgsql-patches/2006-09/msg00260.php. The idea was to first implement just the WITH clause itself as a first patch, and then extend to include the recursive features with a secondary patch. In short, if people don't mind waiting for my free cycles to come along then I will continue to chip away at it; otherwise if it's considered an essential for 8.3 with an April deadline then I will happily hand over to Jonah. Kind regards, Mark.
On 12/30/06, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> wrote: > In short, if people don't mind waiting for my free cycles to come along > then I will continue to chip away at it; otherwise if it's considered an > essential for 8.3 with an April deadline then I will happily hand over > to Jonah. I'd say it's probably essential given my last, shall we say, "mishap".So I guess I'll start up discussion on the design againsoon. I'm leaving in a couple days to travel up to NJ so expect discussion to start again on Tuesday of next week. As always, I too wouldn't have a problem if someone else is going to see it through for 8.3. -- Jonah H. Harris, Software Architect | phone: 732.331.1324 EnterpriseDB Corporation | fax: 732.331.1301 33 Wood Ave S, 3rd Floor | jharris@enterprisedb.com Iselin, New Jersey 08830 | http://www.enterprisedb.com/
Le mardi 02 janvier 2007 à 18:08 -0700, Jonah H. Harris a écrit : <blockquote type="CITE"><pre> <font color="#000000">On 12/30/06, Mark Cave-Ayland <<a href="mailto:mark.cave-ayland@ilande.co.uk">mark.cave-ayland@ilande.co.uk</a>>wrote:</font> <font color="#000000">> In short, if people don't mind waiting for my free cycles to come along</font> <font color="#000000">> then I will continue to chip away at it; otherwise if it's considered an</font> <font color="#000000">> essential for 8.3 with an April deadline then I will happily hand over</font> <font color="#000000">> to Jonah.</font> <font color="#000000">I'd say it's probably essential given my last, shall we say, "mishap".</font> <font color="#000000"> So I guess I'll start up discussion on the design again soon. I'm</font> <font color="#000000">leaving in a couple days to travel up to NJ so expect discussion to</font> <font color="#000000">start again on Tuesday of next week.</font> <font color="#000000">As always, I too wouldn't have a problem if someone else is going to</font> <font color="#000000">see it through for 8.3.</font> </pre></blockquote> Why not looking at <a href="http://gppl.moonbone.ru/">http://gppl.moonbone.ru/</a> <font size="1">evgenpotemkin.</font> has ever made a patch for WITH and CONNECT BY?<br /><br /> I'm ready to test these features...(RECURSIVE) when they'll land in CVS...<br /><br /> Hubert FONGARNAND _______________________________________________<br/>Ce message et les �ventuels documents joints peuvent contenir des informationsconfidentielles.<br />Au cas o� il ne vous serait pas destin�, nous vous remercions de bien vouloir le supprimeret en aviser imm�diatement l'exp�diteur. Toute utilisation de ce message non conforme � sa destination, toute diffusionou publication, totale ou partielle et quel qu'en soit le moyen est formellement interdite.<br />Les communicationssur internet n'�tant pas s�curis�es, l'int�grit� de ce message n'est pas assur�e et la soci�t� �mettrice nepeut �tre tenue pour responsable de son contenu.
On Wed, 2007-01-03 at 09:45 +0100, Hubert FONGARNAND wrote: > Why not looking at http://gppl.moonbone.ru/ evgen potemkin. has ever > made a patch for WITH and CONNECT BY? > > I'm ready to test these features... (RECURSIVE) when they'll land in > CVS... Hi Hubert, IIRC there were two issues - firstly the license for the patch was GPL as opposed to BSD used for PostgreSQL, and secondly I believe Tom and some of the other developers were not happy with some of the internal changes made by the patch. Fortunately it looks as if Jonah can commit some serious time to this, so your offer of helping to test when the code hits CVS is gratefully received :) Kind regards, Mark.
On 1/3/07, Hubert FONGARNAND <informatique.internet@fiducial.fr> wrote: > Why not looking at http://gppl.moonbone.ru/ evgen potemkin. has ever made a > patch for WITH and CONNECT BY? Nope, no good. This is what I started with last time and the refactoring attempt at WITH is just too massive. As for CONNECT BY, PostgreSQL does not want the syntax, they want ANSI/ISO WITH [RECURSIVE]... so even starting there isn't great. This is really something that needs to be decided on before implementation... or it will probably never get in. -- Jonah H. Harris, Software Architect | phone: 732.331.1324 EnterpriseDB Corporation | fax: 732.331.1301 33 Wood Ave S, 3rd Floor | jharris@enterprisedb.com Iselin, New Jersey 08830 | http://www.enterprisedb.com/
On 1/3/07, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> wrote: > IIRC there were two issues - firstly the license for the patch was GPL > as opposed to BSD used for PostgreSQL Yes, however Evgen was kind enough to grant me a BSD license for it should I get it committed into PostgreSQL. However, with the amount of refactoring and community design decisions to be made, I doubt any of the patch would be usable. > ... secondly I believe Tom and some of the other developers were not > happy with some of the internal changes made by the patch. Yes, there are numerous bug reports from patched versions especially on Gentoo. As for the WITH support, it was written for PostgreSQL 7.2/7.3 and was a basic preliminary proof-of-concept. -- Jonah H. Harris, Software Architect | phone: 732.331.1324 EnterpriseDB Corporation | fax: 732.331.1301 33 Wood Ave S, 3rd Floor | jharris@enterprisedb.com Iselin, New Jersey 08830 | http://www.enterprisedb.com/
On Wed, Jan 03, 2007 at 04:19:19PM -0700, Jonah H. Harris wrote: > On 1/3/07, Hubert FONGARNAND <informatique.internet@fiducial.fr> wrote: > >Why not looking at http://gppl.moonbone.ru/ evgen potemkin. has > >ever made a patch for WITH and CONNECT BY? > > Nope, no good. This is what I started with last time and the > refactoring attempt at WITH is just too massive. As for CONNECT BY, > PostgreSQL does not want the syntax, they want ANSI/ISO WITH > [RECURSIVE]... so even starting there isn't great. > > This is really something that needs to be decided on before > implementation... or it will probably never get in. As I recall, it was decided long ago, and the conclusions were: * Only BSD-compatibly licensed code goes in PostgreSQL's code base, and * PostgreSQL will only support the SQL:2003 standard WITH (RECURSIVE) syntax in the main line code. Cheers, D -- David Fetter <david@fetter.org> http://fetter.org/ phone: +1 415 235 3778 AIM: dfetter666 Skype: davidfetter Remember to vote!
On 1/3/07, David Fetter <david@fetter.org> wrote: > As I recall, it was decided long ago, and the conclusions were: > * Only BSD-compatibly licensed code goes in PostgreSQL's code base, > * PostgreSQL will only support the SQL:2003 standard WITH (RECURSIVE) > syntax in the main line code. Yes, see later response :) -- Jonah H. Harris, Software Architect | phone: 732.331.1324 EnterpriseDB Corporation | fax: 732.331.1301 33 Wood Ave S, 3rd Floor | jharris@enterprisedb.com Iselin, New Jersey 08830 | http://www.enterprisedb.com/