not aborting transactions on failed select

Hi.
Is there any way to make postgres not abort the transaction on failed
select?

I have a system that uses ORM to retrieve data; ORM is very slow for some
cases, so there's a perf optimization that issues ANSI SQL queries directly
thru ORM's built-in passthru, and falls back to ORM if they fail.
All of these queries are select-s, and the retrieval can be a part of an
external transaction.

It worked great in MySQL, but Postgres being differently
ANSI-non-compliant, the queries do fail. Regardless of whether they can be
fixed, in such cases the fall-back should work. What happens in Postgres
however is that the transaction is aborted; all further SELECTs are ignored.

Is there some way to get around this and not abort the transaction on
failed selects?
This behavior seems extremely counter-intuitive.

Thanks.

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