msokolov opened a new pull request, #15430:
URL: https://github.com/apache/lucene/pull/15430

   This is a stab at implementing the previously-published BpVectorReorderer as 
part of the codec.  The version we have now can be used as a merge policy to 
reorder docids by doing BP over a vector field.  This version allows for the 
ordering to be done at the vector ordinal level for each field independently 
while docids may be soprted by some other IndexSort.
   
   The code is fully working as far as I can tell, and I think the design is 
reasonable, but some TODOs and nocommits remain:
   
   1. Test results have so far been underwhelming, and I plan to continue to 
work to see if it is producing results thatare on par with the merge policy 
version. There might be a bug somewhere, and if anyone is interested in 
looking, I'd appreciate feedback.
   2. There isn't a convenient way to enable/disable reordering in tests. 
Currently a few tests will fail (the TestBpVectorReorder in particular since it 
is reordering both at the codec level and separately in the merge policy.


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