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https://issues.apache.org/jira/browse/LUCENE-7283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15558249#comment-15558249
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Yonik Seeley commented on LUCENE-7283:
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bq. p.s. please update the description to include UninvertingReader (which is
much larger in scope than just SCW and unrelated to SCW)
Indeed, the original JIRA description of "Move SlowCompositeReaderWrapper to
solr sources" doesn't begin to describe the impact this issue will have on
normal Lucene users in 7.0. I imagine they will be quite surprised to see
everything about the FieldCache removed and left with no ability to Sort on an
indexed-only field.
It really seems like there should be a lot more consensus around removing
functionality on this scale.
> Move SlowCompositeReaderWrapper and uninverting package to solr sources
> -----------------------------------------------------------------------
>
> Key: LUCENE-7283
> URL: https://issues.apache.org/jira/browse/LUCENE-7283
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 6.1, master (7.0)
>
> Attachments: LUCENE-7283.patch
>
>
> Spinoff from LUCENE-6766, where we fixed index-time sorting to have first
> class support in Lucene's ore, and no longer use
> {{SlowCompositeReaderWrapper}}.
> This is a dangerous, long living class, that tries to pretend a set of N
> segments is actually just a single segment. It's a leaky abstraction, has
> poor performance, and puts undue pressure on the APIs of new Lucene features
> to try to keep up this illusion.
> With LUCENE-6766, finally all usage of this class (except for
> {{UninvertedReader}} tests, which should maybe also move out?) has been
> removed from Lucene, so I think we should move it to Solr. This may also
> lead to a solution for LUCENE-7086 since e.g. the class could tap into solr's
> schema to "know" how to handle points fields properly.
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