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https://issues.apache.org/jira/browse/NIFI-7464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116547#comment-17116547
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Alessandro D'Armiento commented on NIFI-7464:
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This could be made optional with an additional parameter in CSVRecordSetWriter
> CSVRecordSetWriter does not output header for record sets with zero records
> ---------------------------------------------------------------------------
>
> Key: NIFI-7464
> URL: https://issues.apache.org/jira/browse/NIFI-7464
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.11.3
> Reporter: Karl Fredrickson
> Priority: Major
>
> If you configure CSVRecordSetWriter to output a header row, and a processor
> such as QueryRecord or ConvertRecord writes out a flowfile with zero records
> using the CSVRecordSetWriter, the header row will not be included.
> This affects QueryRecord and ConvertRecord processors and presumably all
> other processors that can be configured to use CSVRecordWriter.
> I suppose this could be intentional behavior but older versions of NiFi like
> 1.3 do output a header even when writing a zero record flowfile, and this
> caused some non-trivial issues for us in the process of upgrading from 1.3 to
> 1.11. We fixed this on our NiFi installation by making a small change to the
> WriteCSVResult.java file and then rebuilding the NiFi record serialization
> services NAR.
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