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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/11/06 18:55:29 UTC
[GitHub] [arrow] drusso opened a new pull request #8606: ARROW-10510: [Rust] [DataFusion] Benchmark COUNT(DISTINCT) queries.
drusso opened a new pull request #8606:
URL: https://github.com/apache/arrow/pull/8606
[ARROW-10510](https://issues.apache.org/jira/browse/ARROW-10510)
This change adds benchmarks for `COUNT(DISTINCT)` queries. This is a small follow-up to [ARROW-10043](https://issues.apache.org/jira/browse/ARROW-10043) / #8222. In that PR, a number of implementation ideas were discussed for follow-ups, and having benchmarks will help evaluate them.
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There are two benchmarks added:
* wide: all of the values are distinct; this is looking at worst-case performance
* narrow: only a handful of distinct values; this is closer to best-case performance
The wide benchmark runs ~ 7x slower than the narrow benchmark.
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[GitHub] [arrow] github-actions[bot] commented on pull request #8606: ARROW-10510: [Rust] [DataFusion] Benchmark COUNT(DISTINCT) queries.
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on pull request #8606:
URL: https://github.com/apache/arrow/pull/8606#issuecomment-723248595
https://issues.apache.org/jira/browse/ARROW-10510
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[GitHub] [arrow] nevi-me closed pull request #8606: ARROW-10510: [Rust] [DataFusion] Benchmark COUNT(DISTINCT) queries.
Posted by GitBox <gi...@apache.org>.
nevi-me closed pull request #8606:
URL: https://github.com/apache/arrow/pull/8606
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