def has_vector(self, docnum, fieldid):
        raise NotImplementedError
This method is called when there is the remote possibility
dataset/ETHPy150Open dokipen/whoosh/src/whoosh/reading.py/IndexReader.has_vector--crossover with--dataset/ETHPy150Open uwdata/termite-data-server/web2py/gluon/contrib/qdb.py/Qdb.user_call