David Handermann created NIFI-9862:
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Summary: Update JsonTreeReader to Read Records from a Nested Array
Key: NIFI-9862
URL: https://issues.apache.org/jira/browse/NIFI-9862
Project: Apache NiFi
Issue Type: Improvement
Components: Extensions
Reporter: David Handermann
The {{JsonTreeReader}} leverages the Jackson JSON streaming API to read one or
more records from an {{{}InputStream{}}}. The supporting {{RecordReader}}
implementation expects input JSON to be formatted with the an array as the root
element, or an object containing the entire Record. This approach supports
streamed reading of JSON objects contained within an array as the root element,
but does not support streaming of JSON objects contained within an array nested
inside a wrapping root object.
Some services provide JSON responses that include multiple records in a
wrapping root object as follows:
{noformat}
{
"total": 2,
"records": [
{
"id": 1
},
{
"id": 2
}
]
}
{noformat}
In order to enable streamed processing of nested records, the
{{JsonTreeReader}} should be updated to support an optional property defining
the Property Name of a nested field containing records.
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