[jira] [Created] (LUCENE-7283) Move SlowCompositeReaderWrapper to solr sources

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-7283:
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             Summary: Move SlowCompositeReaderWrapper to solr sources
                 Key: LUCENE-7283
                 URL: https://issues.apache.org/jira/browse/LUCENE-7283
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Michael McCandless


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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