[Zope] ZSQL Method "Maximum rows to retrieve" 0 for unlimited number of rows.

[Celula Research]

Hi Zopistas:

Happy new year.  

I have seen references on "Using '0' for unlimited" for the "Maximum rows to retrieve"
on the Advanced tab of ZSQL Methods.  I tried it and does not actually work;
it returns exactly CERO rows when 0 is put in there.  This is being used with Zope 2.6.2,
PostgreSQL 7.4 and Psycopg 1.0.14

Also, looking into Zope's source code I couldn't find that "0 for unlimited" 
feature.

Does this feature (0 for unlimited) has been removed from Zope 2.6.2 or, in any case,
what happened to it? how to enable it?

Could some of you please comment on the above.  ?

For the record, I know, that the returned "batch"
has to be managed/controlled by other (additional) means as to prevent overflows, 
large waiting times,crashes etc. etc.

Thanks in advance for your comments.

Edward