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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/04/05 20:03:06 UTC
[GitHub] [arrow-datafusion] alamb opened a new issue, #2165: Optimize InList implementation with native types rather than ScalarValue
alamb opened a new issue, #2165:
URL: https://github.com/apache/arrow-datafusion/issues/2165
The basic idea is that instead of using `ScalarValue` which has runtime dispatch overhead, we could use native rust types, like `HashSet<u32>`, etc. I think that could be a couple times faster.
_Originally posted by @Dandandan in https://github.com/apache/arrow-datafusion/pull/2156#discussion_r841898112_
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[GitHub] [arrow-datafusion] tustvold closed issue #2165: Optimize InList implementation with native types rather than ScalarValue
Posted by GitBox <gi...@apache.org>.
tustvold closed issue #2165: Optimize InList implementation with native types rather than ScalarValue
URL: https://github.com/apache/arrow-datafusion/issues/2165
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[GitHub] [arrow-datafusion] Dandandan commented on issue #2165: Optimize InList implementation with native types rather than ScalarValue
Posted by GitBox <gi...@apache.org>.
Dandandan commented on issue #2165:
URL: https://github.com/apache/arrow-datafusion/issues/2165#issuecomment-1089292408
In addition to higher memory usage and dispatching overhead there are two extra sources of overhead:
* Having to convert all values from array items to `ScalarValue`
* Hashing a `Scalarvalue` is slower than hashing a native type.
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