30c2aeab29
Exists matching works on the presence or absence of a field in the JSON of the event. The value of the field is not considered when evaluating a match.[1] * Add sentinel to distinguish between missing fields and existing fields with None values * Update event pattern matching tests to cover this specific use-case. * Add integrated test to cover this scenario within a larger context. [1]: https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-event-patterns-content-based-filtering.html