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Insufficient documentation for UserDefinedPredicate.keep(T) #2273

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Description

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The parquet-mr library invokes UserDefinedPredicate.keep(T) 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.

Reporter: Gabor Szadovszky / @gszadovszky
Assignee: Gabor Szadovszky / @gszadovszky

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Note: This issue was originally created as PARQUET-1489. Please see the migration documentation for further details.

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