FutureWarning in chain.py:360 when fillna on tag columns

[lmeyerov]

Repro

PYTHONPATH=. pytest tests/cypher_tck/test_tck_runner.py -k match-where1-4 -xvs

Observed

/home/lmeyerov/Work/pygraphistry2/graphistry/compute/chain.py:360: FutureWarning: Downcasting object dtype arrays on .fillna, .ffill, .bfill is deprecated and will change in a future version. Call result.infer_objects(copy=False) instead. To opt-in to the future behavior, set `pd.set_option('future.no_silent_downcasting', True)`
  out_df[op._name] = out_df[op._name].fillna(False).astype('bool')

Context

The warning is raised in combine_steps when tagging node/edge columns during chain execution.

Expected

No FutureWarning when filling and coercing the tag columns.

Possible fix

Consider out_df[op._name] = out_df[op._name].fillna(False).infer_objects(copy=False).astype('bool'), or explicitly cast to boolean dtype before .fillna.