unwrap-key-value.adoc

Unwrap KeyValue

If the record value is a KeyValue, the unwrap-key-value transform function extracts the KeyValue’s key or value and makes it the record value.
The step name is unwrap-key-value, and the UserConfig is controlled here: {"steps": [{"type": "unwrap-key-value"}]}.

Parameters:

Parameter	Description
unwrapKey	By default, the KeyValue’s value is unwrapped. Set this parameter to true to unwrap the key instead.

Example

1. Produce an AVRO message with the payload: {key={keyField: key}, value={valueField: value}}.

   AVRO

   {key={keyField: key}, value={valueField: value}}

   Result

   {"valueField": "value"}

2. The function extracts the KeyValue’s key and outputs {valueField: value} to the output topic.

What’s next?

For more, see index.adoc or the Pulsar documentation.