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https://issues.apache.org/jira/browse/CRUNCH-501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14333761#comment-14333761
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Gabriel Reid commented on CRUNCH-501:
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Yeah, indeed not super-simple -- it's surprising to hear that this is only
coming up for the first time now.
I think we can fix this by adding the value PType to AggregatorCombineFn as a
constructor parameter, and then detach the values in there before passing them
in to aggregator.update. That's all internal, so wouldn't break any backwards
compatibility.
> Object reuse issue in combineValues(Aggregator)
> -----------------------------------------------
>
> Key: CRUNCH-501
> URL: https://issues.apache.org/jira/browse/CRUNCH-501
> Project: Crunch
> Issue Type: Bug
> Reporter: Brandon Davis
>
> I'm trying to use combineValues on a PGroupedTable. I am using
> Aggregators.FIRST_N. If I have 20 keys in my PGroupedTable, then I only get
> 20 distinct values because the AggregatorCombineFn and FirstNAggregator don't
> detach the values from the incoming iterator.
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