Adrien Grand created LUCENE-10031:
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Summary: Speedup to SortedDocIDMerger when sorting on
low-cardinality fields
Key: LUCENE-10031
URL: https://issues.apache.org/jira/browse/LUCENE-10031
Project: Lucene - Core
Issue Type: Improvement
Reporter: Adrien Grand
I've been looking at profiles of indexing with index sorting enabled and saw
non-negligible time spent in SortedDocIDMerger. This isn't completely
surprising as this little class is called on every document whenever merging
postings, doc values, stored fields, etc.
I'm especially interested in cases when the sort key is on a low cardinality
field, so the priority queue doesn't get reordered often. I've been playing
with a change to SortedDocIdMerger that makes merging significantly faster in
that case.
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