Joris Van den Bossche created ARROW-7273:
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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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