@discover.register(Collection)
def discover_pymongo_collection(coll, n=50):
    items = list(take(n, coll.find()))
    if not items:
        return var * Record([])
    oid_cols = [k for k, v in items[0].items() if isinstance(v, ObjectId)]
    for item in items:
        for col in oid_cols:
            del item[col]

    ds = discover(items)

    if isdimension(ds[0]):
        return coll.count() * ds.subshape[0]
    else:
        raise ValueError("Consistent datashape not found")
dataset/ETHPy150Open blaze/odo/odo/backends/mongo.py/discover_pymongo_collection/original