Markus Kohler created BEAM-14228:
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Summary: Nullable Integer support in with pandas not working as
expected
Key: BEAM-14228
URL: https://issues.apache.org/jira/browse/BEAM-14228
Project: Beam
Issue Type: Bug
Components: dsl-dataframe
Affects Versions: 2.37.0
Reporter: Markus Kohler
I reading data from a parquet and one of the columns is a Nullable Integer
([https://pandas.pydata.org/docs/user_guide/integer_na.html#integer-na)]
Not 100% sure I correctly declared it:
{code:java}
import typing
from typing import Dict, Iterable, List, Optional
import apache_beam as beam
from apache_beam.options.pipeline_options import PipelineOptions
class Record(typing.NamedTuple):
port: Optional[int]
#port: str
recFields=set([i for i in Record.__dict__.keys() if i[:1] != '_'])
beam.coders.registry.register_coder(Record,beam.coders.RowCoder)
def extractDF(tuple):
df=tuple[1].to_pandas()
print(type(df.port.dtype))
return df
input_patterns = ['data/*.parquet']
#local runner
options = PipelineOptions(flags=[], type_check_additional='all')
def toRecords(df):
#df["port"]=None
return df.to_dict('records')
with beam.Pipeline(options=options) as pipeline:
lines = (pipeline | 'Create file patterns' >> beam.Create(input_patterns)
| 'Read Parquet files' >>
beam.io.ReadAllFromParquetBatched(columns=recFields,with_filename=True)
| 'Extract DF' >> beam.Map(extractDF )
| 'To dictionaries' >> beam.FlatMap(toRecords)
| 'ToRows' >> beam.Map(lambda x: Record(**x)).with_output_types(Record)
| "print">> beam.Map(print)){code}
This fails with an type error.
When I uncomment the line in toRecords to set everything to None it works fine.
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