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https://issues.apache.org/jira/browse/LUCENE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121830#comment-13121830
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Michael McCandless commented on LUCENE-3433:
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bq. I agree with simon here, can't we spin off a different issue for these?
+1: I agree removal of SortedSource is unrelated to this issue. We
should discuss it under a new issue (it's obviously contentious), and
for this issue do the nice cleanups we all agree on. It shouldn't be
removed under this one.
One shouldn't have to pay such a high price (uninversion on searcher
startup) to sort or group by a string field, which we do today. It's
silly to re-invert on every searcher startup when we can sort once
during indexing and record that in the doc values, and SortedSource
gives us that.
Besides the merge RAM usage (which I think is minor) is there a
technical/code complexity reason that SortedSource should be removed?
Does it somehow require the enums or something? I'm trying to
understand how/why it suddenly got coupled into this issue...
I think sorting and grouping by string fields are first class
functions for Lucene.
> Random access non RAM resident IndexDocValues (CSF)
> ---------------------------------------------------
>
> Key: LUCENE-3433
> URL: https://issues.apache.org/jira/browse/LUCENE-3433
> Project: Lucene - Java
> Issue Type: New Feature
> Affects Versions: 4.0
> Reporter: Yonik Seeley
> Assignee: Simon Willnauer
> Fix For: 4.0
>
> Attachments: LUCENE-3433.patch, LUCENE-3433.patch, LUCENE-3433.patch,
> sorted_source.patch
>
>
> There should be a way to get specific IndexDocValues by going through the
> Directory rather than loading all of the values into memory.
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