[LUCENE-7283] Move SlowCompositeReaderWrapper and uninverting package to solr sources

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.1, 7.0
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 13/May/16 10:34
• Updated: 28/Aug/22 14:58
• Resolved: 25/May/16 14:34

Description

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.

Issue Links

• is related to: SOLR-9160 Sync 6x and 7.0 UninvertingReader for Solr