Karl Fredrickson created NIFI-7464:
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Summary: 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
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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