from pymongoarrow.monkey import patch_all
patch_all()

from pymongoarrow.api import Schema
schema = Schema({'_id': int, 'measure': float, 'status': pyarrow.string(), 'installed_on': datetime})

df_a = col.aggregate_pandas_all([{'$match':{'status':'active'}}], schema=schema)
df_a

df_a = col.aggregate_pandas_all([{'$match':{'status':'active'}}])

Traceback (most recent call last):
  File "/Users/julius/source.py", line 60, in <module>
    df_a = col.aggregate_pandas_all([{'$match':{'status':'active'}}])
  File "/Users/julius/Work/mongo-arrow/bindings/python/pymongoarrow/api.py", line 192, in aggregate_pandas_all
    return _arrow_to_pandas(aggregate_arrow_all(collection, pipeline, schema=schema, **kwargs))
  File "/Users/julius/Work/mongo-arrow/bindings/python/pymongoarrow/api.py", line 133, in aggregate_arrow_all
    pipeline.append({"$project": schema._get_projection()})
AttributeError: 'NoneType' object has no attribute '_get_projection'