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https://issues.apache.org/jira/browse/LUCENE-9113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-9113.
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Fix Version/s: 8.5
Resolution: Fixed
> Speed up merging doc values terms dictionaries
> ----------------------------------------------
>
> Key: LUCENE-9113
> URL: https://issues.apache.org/jira/browse/LUCENE-9113
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Fix For: 8.5
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> 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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