On 7 Mar, 15:55, Michael Bayer <mike...@zzzcomputing.com> wrote:
> the left outer join means there is a lazy=False or lazy='joinedload' on the 
> relationship, or in this case since its sporadic, the parent Invoice is 
> likely being loaded with an option like joinedload(Product.vat).    The 
> options specified in Query get attached to lazy loaders later in the chain, 
> if the given joinedload() chain doesn't start from the entity being queried 
> (which is probably the case if the query uses joinedload() and not 
> joinedload_all()).

Problem solved, many thanks :)

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