[jira] [Updated] (ARROW-10955) [Python] Cannot read empty json lists and write them as parquet

["Neal Richardson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson updated ARROW-10955:
------------------------------------
    Summary: [Python] Cannot read empty json lists and write them as parquet  (was: Cannot read empty json lists and write them as parquet)

> [Python] Cannot read empty json lists and write them as parquet
> ---------------------------------------------------------------
>
>                 Key: ARROW-10955
>                 URL: https://issues.apache.org/jira/browse/ARROW-10955
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++, Python
>    Affects Versions: 0.17.0, 0.17.1, 1.0.0, 2.0.0
>         Environment: linux and mac
>            Reporter: Peter Goldsborough
>            Priority: Major
>
> We're using Arrow to convert from JSON to Parquet and occasionally have empty lists in our json. Reading such JSON into an Arrow table and writing it to Parquet currently fails. We noticed this issue in our C++ Arrow code, but it also happens from Python.
> Minimal repro:
> input.json:
> {"foo": []}
>  
> convert.py:
>  import pyarrow.json
>  import pyarrow.parquet
> t = pyarrow.json.read_json("input.json")
>  pyarrow.parquet.write_table(t, "out.parquet")
>   
> Produces:
> Traceback (most recent call last):
>  File "repro.py", line 5, in <module>
>  pyarrow.parquet.write_table(t, "out.parquet")
> env/lib/python3.8/site-packages/pyarrow/parquet.py", line 1717, in write_table
>  with ParquetWriter(
>  File "env/lib/python3.8/site-packages/pyarrow/parquet.py", line 554, in __init__
>  self.writer = _parquet.ParquetWriter(
>  File "pyarrow/_parquet.pyx", line 1409, in pyarrow._parquet.ParquetWriter.__cinit__
>  File "pyarrow/error.pxi", line 84, in pyarrow.lib.check_status
>  pyarrow.lib.ArrowInvalid: NullType Arrow field must be nullable
>  



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