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https://issues.apache.org/jira/browse/PARQUET-780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15688697#comment-15688697
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Deepak Majeti commented on PARQUET-780:
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NULL values are not explicitly stored in the Parquet format. The definition
level must be 0 (< max definition level) to represent a NULL value.
When reading the values back, the definition level is used to implicitly derive
the NULL value.
> WriterBatch API does not properly handle NULL values for byte array types
> -------------------------------------------------------------------------
>
> Key: PARQUET-780
> URL: https://issues.apache.org/jira/browse/PARQUET-780
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cpp
> Affects Versions: cpp-0.1
> Reporter: Mike Trinkala
>
> Passing a NULL 'values' parameter into WriteBatch for a *ByteArray type will
> cause a segfault in the dictionary encoder.
> Related: https://issues.apache.org/jira/browse/PARQUET-719
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