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ARROW-10591: [Rust] Improve take (-20 to -40%) #8670
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Member
Author
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I am still not comfortable with this, so I am closing it for now. |
Contributor
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This looks like a neat take on take (pardon the pun!). Is there anything in particular preventing adoption of this approach? |
Member
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Performance: with the fix on the benchmarks for |
Contributor
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Got it, thanks for clarifying. |
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TL;DR:
StructArraytakeofStructArrayandListArraytakeby 1.2-1.9Motivation
Same motivation as #8630 plus solving the following issues:
They are all inter-connected, which made it difficult to solve one without solving the other (as the tests either pass or don't).
This PR
This PR extends
MutableDataArrayto support extending theMutableDataArraywith nulls, thereby allowing to correctly implementtakeandfilterforStructArray. Specifically, currently,takefor structs with nulls is incorrect (ARROW-10593)filterdoes not supportStructArray(ARROW-10591)This PR fixes both issues.
This PR also converts the implementation of
taketo useMutableDataArray, thereby reducing the chance of bugs and maintenance burden, as well as performance. While doing that, I found 1 bug and 1 improvement, that this PR addresses:takehas a bug on which nulls are not correctly taken into account (ARROW-10593)taketakes all values from a struct array, even when we are just taking a null (ARROW-10594)This PR fixes both issues.
Finally, this improves performance of
takeby 1.2-1.9x (which also impacts the performance of thesort).Benchmarks
set -e git checkout 010d260173a9e110901ca67372a4ac379a615a13 cargo bench --bench filter_kernels git checkout mutable_filter cargo bench --bench filter_kernels