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https://issues.apache.org/jira/browse/BEAM-41?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15856999#comment-15856999
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Kenneth Knowles commented on BEAM-41:
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Also I should mention that starting with BEAM-42 / map state is probably better
since SetState is then probably pretty trivial. But you can check the
interfaces in, add support to {{DoFnSignatures}}, etc, without any runner
actually implementing them.
> State for "Set" data, supporting efficient membership checks
> ------------------------------------------------------------
>
> Key: BEAM-41
> URL: https://issues.apache.org/jira/browse/BEAM-41
> Project: Beam
> Issue Type: New Feature
> Components: beam-model
> Reporter: Kenneth Knowles
> Assignee: Jingsong Lee
> Priority: Minor
> Labels: State
>
> Analogous to how BagState supports efficient blind writes, a SetState would
> support efficient membership checking without reading the entire set.
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