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Optimize approx_distinct() for strings #21035
Description
Is your feature request related to a problem or challenge?
approx_distinct is approximately 25 times slower for strings than for integers on my machine, which is a bit surprising. Seems like we're doing some unnecessary copying that can be easily avoided.
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Additional context
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Activity
neilconway commentedon Mar 18, 2026
take
[-]Optimize approx_distinct() for strings[/-][+]Optimize `approx_distinct()` for strings[/+]perf: Optimize `approx_distinct()` for string, binary inputs (#21037)
perf: Optimize `approx_distinct()` for string, binary inputs (apache#…