Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/16085
Another option is adding `@JsonIgnoreProperties` to these classes to ignore
unknown fields. However, there are two disadvantages:
- It's easy to ignore something that we don't want to ignore in future by
mistake.
- Since the old logs don't contain the new added fields, they will be set
to `null`. It forces `StreamingQueryListener` to handle null values.
Hence, I don't choose this way.
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