[jira] [Commented] (FLINK-25217) FLIP-190: Support Version Upgrades for Table API & SQL Programs

["Timo Walther (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-25217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17694990#comment-17694990 ] 

Timo Walther commented on FLINK-25217:
--------------------------------------

[~yunta] due to multiple switches of my employer this effort had to be paused. Currently missing are:
* Test infra across Flink releases including restores from savepoints.
* Documentation with limitations and guarantees.
* DataStream API integration into compiled plan.

It is likely that I (or somebody from my team) can continue the first 2 items for Flink 1.17.

> 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
>            Priority: Minor
>              Labels: auto-deprioritized-major, pull-request-available
>
> 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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