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perf: improve approx_distinct performance 100x when there are fewer distinct values with many groups#22768

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haohuaijin wants to merge 7 commits into
apache:mainfrom
haohuaijin:approx-distinct-improve
Open

perf: improve approx_distinct performance 100x when there are fewer distinct values with many groups#22768
haohuaijin wants to merge 7 commits into
apache:mainfrom
haohuaijin:approx-distinct-improve

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Commits on Jun 5, 2026