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https://issues.apache.org/jira/browse/SPARK-55122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18085544#comment-18085544
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Wenchen Fan commented on SPARK-55122:
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re-target to 4.3
> Allow seamless and sequential source switching for streaming queries
> --------------------------------------------------------------------
>
> Key: SPARK-55122
> URL: https://issues.apache.org/jira/browse/SPARK-55122
> Project: Spark
> Issue Type: Epic
> Components: Structured Streaming
> Affects Versions: 4.3.0
> Reporter: Eric Marnadi
> Priority: Major
>
> Users may have multiple sources of data, for example a backfill and live
> source, that they want to process one after the other. We propose the
> `.followedBy` API where the user can specify multiple stateless streaming DFs
> that will execute one after the other, which will hydrate the same downstream
> stateful operators with no need for manual checkpoint intervention.
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