Timo Walther created FLINK-25217:
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Summary: FLIP-190: Support Version Upgrades for Table API & SQL
Programs
Key: FLINK-25217
URL: https://issues.apache.org/jira/browse/FLINK-25217
Project: Flink
Issue Type: New Feature
Components: Table SQL / API, Table SQL / Planner
Reporter: Timo Walther
Nowadays, the Table & SQL API is as important to Flink as the DataStream API.
It is one of the main abstractions for expressing pipelines that perform
stateful stream processing. Users expect the same backwards compatibility
guarantees when upgrading to a newer Flink version as with the DataStream API.
In particular, this means:
* once the operator topology is defined, it remains static and does not change
between Flink versions, unless resulting in better performance,
* business logic (defined using expressions and functions in queries) behaves
identical as before the version upgrade,
* the state of a Table & SQL API program can be restored from a savepoint of a
previous version,
* adding or removing stateful operators should be made possible in the
DataStream API.
The same query can remain up and running after upgrades.
https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=191336489
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