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https://issues.apache.org/jira/browse/PARQUET-2067?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved PARQUET-2067.
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Fix Version/s: cpp-6.0.0
Resolution: Fixed
Issue resolved by pull request 11281
[https://github.com/apache/arrow/pull/11281]
> [C++] null_count and num_nulls incorrect for repeated columns
> --------------------------------------------------------------
>
> Key: PARQUET-2067
> URL: https://issues.apache.org/jira/browse/PARQUET-2067
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cpp
> Reporter: Micah Kornfield
> Priority: Major
> Labels: pull-request-available
> Fix For: cpp-6.0.0
>
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Currently only nulls at the leaf are accounted for in the null count
> statstics. For nested lists this is incorrect because null lists have zero
> elements and don't show up in the leaf.
>
> Example from mailing list discussion
>
> [[0, 1], None, [2, None, 3]]
>
> should have a null count of 2 (it currently reports as 1).
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