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https://issues.apache.org/jira/browse/LUCENE-7086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15255256#comment-15255256
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Michael McCandless commented on LUCENE-7086:
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bq. it seems that this makes SortingMergePolicy (which uses
SlowCompositeReaderWrapper) incompatible with point fields
Yes, unfortunately ... so currently you cannot do index-time sorting if you
index points. I agree that sucks and we need to fix it ... though I don't
understand why index-time sorting needs to use the inefficient
{{SlowCompositeReaderWrapper}} ... it is the last place in Lucene that relies
on it.
> SlowCompositeReaderWrapper does not support point values
> --------------------------------------------------------
>
> Key: LUCENE-7086
> URL: https://issues.apache.org/jira/browse/LUCENE-7086
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Adrien Grand
> Assignee: Michael McCandless
> Fix For: master, 6.0
>
> Attachments: LUCENE-7086.patch, LUCENE-7086.patch
>
>
> SlowCompositeReaderWrapper.getPointValues always returns null. I think this
> is trappy and we should either implement it or throw an
> UnsupportedOperationException instead.
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