[jira] [Created] (ARROW-8654) [Python] pyarrow 0.17.0 fails reading "wide" parquet files

["Mike Macpherson (Jira)" <ji...@apache.org>]

Mike Macpherson created ARROW-8654:
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             Summary: [Python] pyarrow 0.17.0 fails reading "wide" parquet files
                 Key: ARROW-8654
                 URL: https://issues.apache.org/jira/browse/ARROW-8654
             Project: Apache Arrow
          Issue Type: Bug
            Reporter: Mike Macpherson


{code:java}
import pandas as pd

num_rows, num_cols = 1000, 45000

df = pd.DataFrame(np.random.randint(0, 256, size=(num_rows, num_cols)).astype(np.uint8))

outfile = "test.parquet"
df.to_parquet(outfile)
del df

df = pd.read_parquet(fout)
{code}
Yields:
{noformat}
df = pd.read_parquet(outfile) 
File "/jupyter/venv/lib/python3.6/site-packages/pandas/io/parquet.py", line 310, in read_parquet 
return impl.read(path, columns=columns, kwargs) 
File "/jupyter/venv/lib/python3.6/site-packages/pandas/io/parquet.py", line 125, in read 
path, columns=columns, kwargs 
File "/jupyter/venv/lib/python3.6/site-packages/pyarrow/parquet.py", line 1530, in read_table 
partitioning=partitioning) 
File "/jupyter/venv/lib/python3.6/site-packages/pyarrow/parquet.py", line 1189, in __init__ 
self.validate_schemas() 
File "/jupyter/venv/lib/python3.6/site-packages/pyarrow/parquet.py", line 1217, in validate_schemas 
self.schema = self.pieces[0].get_metadata().schema 
File "/jupyter/venv/lib/python3.6/site-packages/pyarrow/parquet.py", line 662, in get_metadata 
f = self.open() 
File "/jupyter/venv/lib/python3.6/site-packages/pyarrow/parquet.py", line 669, in open 
reader = self.open_file_func(self.path) 
File "/jupyter/venv/lib/python3.6/site-packages/pyarrow/parquet.py", line 1040, in _open_dataset_file 
buffer_size=dataset.buffer_size 
File "/jupyter/venv/lib/python3.6/site-packages/pyarrow/parquet.py", line 210, in __init__ 
read_dictionary=read_dictionary, metadata=metadata) 
File "pyarrow/_parquet.pyx", line 1023, in pyarrow._parquet.ParquetReader.open 
File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status 
OSError: Couldn't deserialize thrift: TProtocolException: Exceeded size limit
{noformat}
This is pandas 1.0.3, and pyarrow 0.17.0.

 

I tried this with pyarrow 0.16.0, and it works. 0.15.1 did as well.

 

I also tried with 40,000 columns aot 45,000 as above, and that does work with 0.17.0.

 

Thanks for all your work on this project!



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