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https://issues.apache.org/jira/browse/STORM-1434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15422709#comment-15422709
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Robert Joseph Evans commented on STORM-1434:
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Streaming joins/group-by really only make since in the context of a window
(large or small). I personally would look towards BEAM and how they handle
this, If you try to do a GROUP BY of any kind outside of a window it results
in an error. If you are doing a rolling or tumbling window it gets a bit more
complex, and because of that complexity I think we should look towards others
that have done something like this already.
As for the aggregation after the group-by that really depends on the
aggregation. Ones where we can checkpoint a partial aggregation instead of all
of the source values would be ideal, but it is an optimization over a more
general aggregation that we probably also want to support.
> Support the GROUP BY clause in StormSQL
> ---------------------------------------
>
> Key: STORM-1434
> URL: https://issues.apache.org/jira/browse/STORM-1434
> Project: Apache Storm
> Issue Type: New Feature
> Components: storm-sql
> Reporter: Haohui Mai
>
> This jira tracks the effort of implement the support `GROUP BY` clause in
> StormSQL.
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