Gabor Szadovszky created PARQUET-1489:
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Summary: 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
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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