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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def expand(self, model=None, ignoreFilter=False):
 """ Expands any shortcuts that were created for this query. Shortcuts provide the user access to joined methods using the '.' accessor to access individual columns for referenced tables. :param model | <orb.Model> :return <orb.Query> || <orb.QueryCompound> """

        queries = []
        current_records = None

        for query in self.__queries:
            sub_q = query.expand(model)
            if not sub_q:
                continue

            # chain together joins into sub-queries
            if ((isinstance(sub_q, orb.Query) and isinstance(sub_q.value(), orb.Query)) and
                 sub_q.value().model(model) != sub_q.model(model)):
                sub_model = sub_q.value().model(model)
                sub_col = sub_q.value().column()
                new_records = sub_model.select(columns=[sub_col])

                sub_q = sub_q.copy()
                sub_q.setOp(sub_q.Op.IsIn)
                sub_q.setValue(new_records)

                if current_records is not None and current_records.model() == sub_q.model(model):
                    new_records = new_records.refine(createNew=False, where=sub_q)
                else:
                    queries.append(sub_q)

                current_records = new_records

            # update the existing recordset in the chain
            elif (current_records is not None and
                 (
                    (isinstance(sub_q, orb.Query) and current_records.model() == query.model(model)) or
                    (isinstance(sub_q, orb.QueryCompound) and current_records.model() in sub_q.models(model))
                 )):
                current_records.refine(createNew=False, where=sub_q)

            # clear out the chain and move on to the next query set
            else:
                current_records = None
                queries.append(query)

        return QueryCompound(*queries, op=self.op())