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https://issues.apache.org/jira/browse/ARROW-8011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Wes McKinney resolved ARROW-8011.
---------------------------------
Fix Version/s: 0.17.0
Resolution: Fixed
Issue resolved by pull request 6562
[https://github.com/apache/arrow/pull/6562]
> [C++] Some buffers not resized when reading from Parquet
> --------------------------------------------------------
>
> Key: ARROW-8011
> URL: https://issues.apache.org/jira/browse/ARROW-8011
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Reporter: Antoine Pitrou
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.17.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> This may leak uninitialized data:
> {code:python}
> >>> table = pa.Table.from_pydict({"a": pa.array([0, None, None])})
> >>>
> >>>
> >>> table.column("a").chunk(0).buffers()[1].to_pybytes()
> >>>
> >>>
> b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
> >>> bio = io.BytesIO()
> >>>
> >>>
> >>> pq.write_table(table, bio, use_dictionary=False)
> >>>
> >>>
> >>> bio.seek(0)
> >>>
> >>>
> 0
> >>> table = pq.read_table(bio)
> >>>
> >>>
> >>> table.column("a").chunk(0).buffers()[1].to_pybytes()
> >>>
> >>>
> b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
> {code}
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