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Posted to github@datafusion.apache.org by "neilconway (via GitHub)" <gi...@apache.org> on 2026/07/28 21:04:50 UTC
[I] Optimize hashing, null-free fast path in `percentile_cont`, `median` [datafusion]
neilconway opened a new issue, #23953:
URL: https://github.com/apache/datafusion/issues/23953
### Is your feature request related to a problem or challenge?
The non-distinct PercentileContAccumulator and MedianAccumulator used the default SipHash hasher for their internal HashMaps. This is slow; switching to foldhash would be significantly faster.
Also, we can add a null-free fast path to `update_batch` and `retract_batch` in both accumulators.
Both ideas copied from recent work on `percentile_cont(DISTINCT)` in #23946
### Describe the solution you'd like
_No response_
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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Re: [I] Optimize hashing, null-free fast path in `percentile_cont`, `median` [datafusion]
Posted by "neilconway (via GitHub)" <gi...@apache.org>.
neilconway closed issue #23953: Optimize hashing, null-free fast path in `percentile_cont`, `median`
URL: https://github.com/apache/datafusion/issues/23953
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Re: [I] Optimize hashing, null-free fast path in `percentile_cont`, `median` [datafusion]
Posted by "neilconway (via GitHub)" <gi...@apache.org>.
neilconway commented on issue #23953:
URL: https://github.com/apache/datafusion/issues/23953#issuecomment-5109663131
take
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