[jira] [Created] (NIFI-12121) Update JSLTTransformJSON to output null-value JSON objects

["Nick dos Remedios (Jira)" <ji...@apache.org>]

Nick dos Remedios created NIFI-12121:
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             Summary: Update JSLTTransformJSON to output null-value JSON objects
                 Key: NIFI-12121
                 URL: https://issues.apache.org/jira/browse/NIFI-12121
             Project: Apache NiFi
          Issue Type: Improvement
          Components: Extensions
    Affects Versions: 1.23.2
            Reporter: Nick dos Remedios


The current implementation of the JSLTTransformJSON processor is configured using the default {{com.schibsted.spt.data.jslt.Parser}} "filter" configuration that results in the removal of any JSON objects where the value is `null`. 

When processing data in Nifi with the "infer schema" option for a reader/writer controller service, this results in some {*}data not conforming to the "original" schema{*}, once it passed through the JSLTTransformJSON processor. As any JSON objects with a null value are removed from the final JSON output.

The [JSLT API allows for the ability to configure|https://github.com/schibsted/jslt/blob/master/docs/api.md#object-key-filter] whether null-value objects are retained or remove. I've checked the Nifi JSLTTransformJSON source and it does not currently set {{.withObjectFilter(filter)}} on the {{Parse}} object.

I'd like to see the JSLTTransformJSON processor be updated with a user-selectable option to include null-value objects in the output (or not). Which would optionally set {{{}Parser.withObjectFilter(true){}}}.



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