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https://issues.apache.org/jira/browse/PARQUET-1489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Szadovszky resolved PARQUET-1489.
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Resolution: Fixed
Fix Version/s: 1.11.0
> Insufficient documentation for UserDefinedPredicate.keep(T)
> -----------------------------------------------------------
>
> Key: PARQUET-1489
> URL: https://issues.apache.org/jira/browse/PARQUET-1489
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-mr
> Reporter: Gabor Szadovszky
> Assignee: Gabor Szadovszky
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.11.0
>
>
> The parquet-mr library invokes
> [UserDefinedPredicate.keep(T)|https://github.com/apache/parquet-mr/blob/master/parquet-column/src/main/java/org/apache/parquet/filter2/predicate/UserDefinedPredicate.java#L47]
> with {{null}} values. (This is the only way parquet-mr can check if a
> {{null}} fulfills the UDP.) This fact is not highlighted in the documentation
> of the method which can easily lead to an unexpected NPE.
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