I am writing a df to a Parquet file using Dask :
df.to_parquet(file, compression='snappy', write_metadata_file=False,\
engine='pyarrow', index=None)
I need to present the contents of the file in an online parquet viewer,
and the columns getting displayed are :
Column1 Column2 Column3 __null_dask_index__
How do I remove the __null_dask_index__
column?
The relevant kwarg here is write_index
:
from dask.datasets import timeseries
from pyarrow.parquet import ParquetFile
df = timeseries(end='2000-01-03').reset_index()
for write_index in [True, False]:
df.to_parquet('test.pqt', write_index=write_index)
f = ParquetFile('test.pqt/part.0.parquet')
print(f.schema.names)
# ['__null_dask_index__', 'timestamp', 'id', 'name', 'x', 'y']
# ['timestamp', 'id', 'name', 'x', 'y']
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