gaobinlong opened a new pull request, #16569:
URL: https://github.com/apache/lucene/pull/16569
### Description
In `TopGroupsCollector`, omit `MaxScoreCollector` when `withinGroupSort` has
score as the primary field. The group max score is instead derived from
`FieldDoc.fields[0]` (set by `RelevanceComparator`), avoiding the overhead of a
parallel score-tracking collector.
This helps improve the performance of grouping search, benchmark on
wikimedium1m:
TaskQPS baseline StdDevQPS
my_modified_version StdDev Pct diff p-value
TermGroup10K 124.24 (12.3%) 126.94
(11.5%) 2.2% ( -19% - 29%) 0.480
TermGroup100 117.89 (31.3%) 120.88
(26.7%) 2.5% ( -42% - 88%) 0.736
TermGroup1M 118.59 (10.9%) 122.83
(13.8%) 3.6% ( -19% - 31%) 0.265
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