Adrien Grand created LUCENE-9113:
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Summary: Speed up merging doc values terms dictionaries
Key: LUCENE-9113
URL: https://issues.apache.org/jira/browse/LUCENE-9113
Project: Lucene - Core
Issue Type: Bug
Reporter: Adrien Grand
The default {{DocValuesConsumer#mergeSortedField}} and
{{DocValuesConsumer#mergeSortedSetField}} implementations create a merged view
of the doc values producers to merge. Unfortunately, it doesn't override
{{termsEnum()}}, whose default implementation of {{next()}} increments the
ordinal and calls {{lookupOrd()}} to retrieve the term. Currently,
{{lookupOrd()}} doesn't take advantage of its current position, and would seek
to the block start and then call {{next()}} up to 16 times to go to the desired
term. While there are discussions to optimize lookups to take advantage of the
current ord (LUCENE-8836), it shouldn't be required for merging to be efficient
and we should instead make {{next()}} call {{next()}} on its sub enums.
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