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Re: [pgsql-general 2011-1-21:] Are there any projects interested in object functionality? (+ rule bases)

From: Nick Rudnick <joerg(dot)rudnick(at)t-online(dot)de>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: [pgsql-general 2011-1-21:] Are there any projects interested in object functionality? (+ rule bases)
Date: 2011-01-31 22:40:39
Message-ID: 4D473A67.4050203@t-online.de (view raw or flat)
Thread:
Lists: pgsql-hackers
Hello Robert,

a good moment to clear things up:

* Of course, compliance with an ISO-SQL standard is of minimal 
importance -- I just grabbed it from the docs.

* The same holds (in a somewhat weaker way) for Java -- I would even 
prefer the more general notion type instead of OO, but I am asking in 
interest of a CS professor I worked for in the past, who is looking for 
impressive demos of non standard DBMS technology. The students might 
find resemblance to Java helpful, who knows?

* In this regard it is of interest in how far there are principal 
efficiency problems with the support of (deeply nested) object like 
structure by the backend, or if the backend may be expected to do this 
job not terribly worse then more specialized OODMS -- of course, I would 
be interested in any discussions of these topics...

* The same question for doing rule bases on top of the PostgreSQL backend...

* For teaching at university courses, on the other hand, efficiency 
would be of lower interest, so there was an idea that there might be 
some (possibly toy example like) efforts to tune the frontend into this 
direction.

== Academic prototypes, which preferably do not bring too much overhead 
for students.

Cheers,

     Nick



On 01/31/2011 03:22 PM, Robert Haas wrote:
> On Mon, Jan 31, 2011 at 3:32 AM, Jörg Roman Rudnick
> <joerg(dot)rudnick(at)t-online(dot)de>  wrote:
>> * are there any people / projects known which are interested in ORDBMS /
>> OODBMS usage of PostgreSQL? Strict SQL standard conformance is less
>> important than the possibility to provide instructive and impressive
>> examples to students.
>>
>> * are there any people / projects known which are interested in extending
>> PostgreSQL at a higher level (plpgsql, creating operators, etc.) for the
>> sake of ORDBMS / OODBMS functionality?
>>
>> * are there any people / projects known which are interested in extending
>> PostgreSQL on the level of developing C code for the sake of ORDBMS / OODBMS
>> functionality?
>>
>> * in how far does the backend support such efforts -- would it do fine, or
>> is rather to be expected that doing ORDBMS / OODBMS driven queries would
>> lead to disastrous performance?
>>
>> * are there any people / projects known which are interested in using the
>> rule (?trigger?) system of PostgreSQL (maybe with extensions) to achieve
>> some kind of rule base / datalog type inference engines? In how far does the
>> backend constrain this in regard of performance?
> I don't really know much about ORDBMS / OODBMS functionality; a quick
> Google search suggests that SQL/OLB is mostly about Java language
> bindings, and there's a separate project (pgsql-jdbc) which works on
> PostgreSQL connectivity for Java.  As far as changes to the core
> database are concerned, user-defined functions and operators are not
> hard to create, but I'm fuzzy on what specifically you want to do.
>


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