dawidwys commented on issue #9422: [FLINK-13697][table-api] Removed deprecated ExternalCatalog API URL: https://github.com/apache/flink/pull/9422#issuecomment-520708891 Hi @bowenli86 I don't think we have a rule about stability of `Evolving` interfaces. I think the rule you are referring to is about state migration gurantees and bugfix support for the last two versions.
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