[Python-Dev] Iterating generator from C (PostgreSQL's pl/python RETUN SETOF/RECORD iterator support broken on RedHat buggy libs) (original) (raw)

Hannu Krosing hannu at tm.ee
Sat May 20 18:53:56 CEST 2006

I try to move this to -dev as I hope there more people reading it who are competent in internal working :). So please replay to -dev only.

The question is about use of generators in embedde v2.4 with asserts enabled.

Can somebody explain, why the code in try2.c works with wrappers 2 and 3 but crashes on buggy exception for all others, that is pure generator and wrappers 1,4,5 ?

In other words, what does [i in i for gen] do differently than other ways of iterating over gen, which helps it to avoid the assert, and also, how could I write something that is still a generator, but does not trigger the assert.

While the right solution is to just fix python (which is done for v2.5) we need a workaround for the following reason

We have added support for returning rows (as tuples and or dictionaries or classes) and sets of boths scalars and rows to PostgreSQL's pl/plpython embedded language, but have some objections to getting this into distribution, because there is a bug in python 2.4 doing a wrong assert and additional bug in how RedHat rpm build process which leaves the buggy asserts in python.so.

So I hoped to write a simple wrapper class, but it only seems to work, when the generator is turned into list, which is not a good solution as it works directly against what generators are good for.

--

Hannu Krosing Database Architect Skype Technologies OÜ Akadeemia tee 21 F, Tallinn, 12618, Estonia

Skype me: callto:hkrosing Get Skype for free: http://www.skype.com

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