Re: plpython triggers are broken for composite-type columns

I wrote:
> Jan Urbański <wulczer@wulczer.org> writes:
>> Now that I understand what's been going on, I'll try to think of a 
>> non-invasive way of fixing that...

> ISTM that conversion of a composite value to Python ought to produce a
> dict, now that the other direction expects a dict.  I can see that this
> is probably infeasible for compatibility reasons in 9.1, but it's not
> too late to fix it for 9.2.  We might have to leave the bug unfixed in
> 9.1, since anything we do about it will represent a compatibility break.

On reflection, can't we fix this as follows: if the value coming in from
Python is a string, just feed it to record_in, the same as we used to.
When I traced through the logic before, it seemed like it was failing
to distinguish strings from sequences, but I would hope that Python
is more strongly typed than that.

I still think the conversion in the other direction ought to yield a
dict, but that's clearly not back-patch material.
        regards, tom lane