jpountz opened a new pull request, #12170:
URL: https://github.com/apache/lucene/pull/12170

   The default implementation of merging doc values resolves the ordinal of a 
document in `nextDoc()`. But sometimes, doc values iterators are consumed 
without retrieving ordinals, e.g. to write the set of documents that have a 
value, so this may be wasteful.
   
   With this change, ordinals get resolved lazily upon `ordValue()`.


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