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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