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https://issues.apache.org/jira/browse/SPARK-31376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077821#comment-17077821
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Jungtaek Lim commented on SPARK-31376:
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Btw it would be even better if you initiate the discussion/proposal in dev@
mailing list (or users@) before, so that the discussion like comments here can
be consumed among community and we all have better understanding. I might be
wrong and someone can correct me. There's less chance on JIRA issue.
> Non-global sort support for structured streaming
> ------------------------------------------------
>
> Key: SPARK-31376
> URL: https://issues.apache.org/jira/browse/SPARK-31376
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 3.1.0
> Reporter: Adam Binford
> Priority: Minor
>
> Currently, all sorting is disallowed with structured streaming queries. Not
> allowing global sorting makes sense, but could non-global sorting (i.e.
> sortWithinPartitions) be allowed? I'm running into this with an external
> source I'm using, but not sure if this would be useful to file sources as
> well. I have to foreachBatch so that I can do a sortWithinPartitions.
> Two main questions:
> * Does a local sort cause issues with any exactly-once guarantees streaming
> queries provides? I can't say I know or understand how these semantics work.
> Or are there other issues I can't think of this would cause?
> * Is the change as simple as changing the unsupported operations check to
> only look for global sorts instead of all sorts?
> I have built a version that simply changes the unsupported check to only
> disallow global sorts and it seems to be working. Anything I'm missing or is
> it this simple?
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