[jira] [Created] (ARROW-7273) [Python] Non-nullable null field is allowed / crashes when writing to parquet

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-7273:
--------------------------------------------

             Summary: [Python] Non-nullable null field is allowed / crashes when writing to parquet
                 Key: ARROW-7273
                 URL: https://issues.apache.org/jira/browse/ARROW-7273
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++, Python
            Reporter: Joris Van den Bossche


It seems to be possible to create a "non-nullable null field". While this does not make any sense (so already a reason to disallow this I think), this can also lead to crashed in further operations, such as writing to parquet:

{code}
In [18]: table = pa.table([pa.array([None, None], pa.null())], schema=pa.schema([pa.field('a', pa.null(), nullable=False)]))

In [19]: table
Out[19]:
pyarrow.Table
a: null not null

In [20]: pq.write_table(table, "test_null.parquet")
WARNING: Logging before InitGoogleLogging() is written to STDERR
F1128 14:08:30.267439 27560 column_writer.cc:837]  Check failed: (nullptr) != (values)
*** Check failure stack trace: ***
Aborted (core dumped)
{code}



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