avro - not showing null field

[raphaelauv]

Issue submitter TODO list

• I've looked up my issue in FAQ
• I've searched for an already existing issues here
• I've tried running main-labeled docker image and the issue still persists there
• I'm running a supported version of the application which is listed here

Describe the bug (actual behavior)

If I produce an avro value with a null field then the UI do not show the field

Expected behavior

I would like to see the field with the value

Your installation details

4c6692

Steps to reproduce

create the topic check
the schema registry schema check-value

{
  "namespace": "team_a.service_b",
  "type": "record",
  "name": "access",
  "doc": "Emitted when",
  "fields": [
    {
      "name": "event_timestamp",
      "type": {
        "type": "long",
        "logicalType": "timestamp-millis"
      },
      "doc": "Timestamp of the event"
    },
    {
      "name": "event_id",
      "type": {
        "type": "string",
        "logicalType": "uuid"
      },
      "doc": "A unique event ID"
    },
    {
      "name": "aaa",
      "type": [
        "null",
        "string"
      ],
      "default": null
    }
  ]
}

Screenshots

No response

Logs

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Additional context

No response

[brandonwittwer]

I think this would be nice to have. kafka-ui did not drop null properties and my teams (having just switched to kafbat) have grown accustomed to seeing null properties as a way of identifying what avro schema was used when serializing the message. Currently, ew nullable properties are not visible if written as null in the message, so its hard to know which schema_ID (subject version in schema registry) was used. (we have multiple producers to some topics and while the schemas are backwards compatible, knowing what schema was written with is helpful)

Based on my code dive, this looks like a decision made by these lines in JsonAvroConversion.java

I'd think a runtime configuration setting to adjust this (or my favorite idea: a personal user setting) would make sense.