Occasional test failures

[ADBond]

See e.g. this run - FAILED tests/test_basic_functionality.py::test_compute_graph_metrics[chdb] - chdb.dbapi.err.InterfaceError: query err: Code: 1001. DB::Exception: pybind11::error_already_set: KeyError: 0

Okay on re-run.

See also this run, and this one.

[ADBond]

Originates from this issue in chdb.

Aside from just re-running tests we could also work around this by setting indexes on frames so that this doesn't come up.