Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/2005
While I appreciate the effort that went into developing this processor, I
think the ticket may be outdated, similar to [PR 1964 - NIFI-4141 (JSON to
Orc)](https://github.com/apache/nifi/pull/1964).
As I commented there,
> Hi,
>
> With the release of Apache NiFi 1.2.0 and 1.3.0, the record paradigm has
been introduced to better support protocol/format/schema conversion. This moves
away from the ConvertXToY type processors in favor of providing custom record
reader and recordset writer controller service implementations which can be
leveraged and re-used by LookupRecord, ConvertRecord, PartitionRecord,
QueryRecord, MergeRecord, UpdateRecord, etc. There is already a JsonTreeReader,
JsonPathReader, and JsonRecordSetWriter available, so if you were to provide an
OrcReader and OrcRecordSetWriter, you would be able to perform bidirectional
conversion of JSON to/from Orc, along with Grok, CSV, Avro, freeform text, and
scripted implementations.
Similarly, I believe the community would be better served by creating a
`XmlRecordReader` and `XmlRecordSetWriter` controller services which can be
leveraged by the entire "record" ecosystem of processors.
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