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https://issues.apache.org/jira/browse/BEAM-9184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17022812#comment-17022812
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Elias Djurfeldt commented on BEAM-9184:
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Ah, looks good! Added a tiny tiny comment. Cheers for implementing
> Add ToSet() combiner, similar to ToList() and ToDict()
> ------------------------------------------------------
>
> Key: BEAM-9184
> URL: https://issues.apache.org/jira/browse/BEAM-9184
> Project: Beam
> Issue Type: New Feature
> Components: sdk-py-core
> Reporter: Jeffrey
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> ToList() doesn't do deduplication, and ToDict() requires key/value tuples.
> Sets are a different type than dicts in Python, so ToSet() is required to
> combine very large PCollections while deduplicating.
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