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https://issues.apache.org/jira/browse/ARROW-10002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17204858#comment-17204858
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Andy Grove commented on ARROW-10002:
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It seems like everyone so far agrees with the direction. The next question is
when do we do this and who wants to do this. Given that the 2.0.0 release is
targetted for next week, should we move this to 3.0.0?
> [Rust] Trait-specialization requires nightly
> --------------------------------------------
>
> Key: ARROW-10002
> URL: https://issues.apache.org/jira/browse/ARROW-10002
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: Rust
> Reporter: Kyle Strand
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.0.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Trait specialization is widely used in the Rust Arrow implementation. Uses
> can be identified by searching for instances of {{default fn}} in the
> codebase:
>
> {code:java}
> $> rg -c 'default fn' ../arrow/rust/
> ../arrow/rust/parquet/src/util/test_common/rand_gen.rs:1
> ../arrow/rust/parquet/src/column/writer.rs:2
> ../arrow/rust/parquet/src/encodings/encoding.rs:16
> ../arrow/rust/parquet/src/arrow/record_reader.rs:1
> ../arrow/rust/parquet/src/encodings/decoding.rs:13
> ../arrow/rust/parquet/src/file/statistics.rs:1
> ../arrow/rust/arrow/src/array/builder.rs:7
> ../arrow/rust/arrow/src/array/array.rs:3
> ../arrow/rust/arrow/src/array/equal.rs:3{code}
>
> This feature requires Nightly Rust. Additionally, there is [no schedule for
> stabilization|https://github.com/rust-lang/rust/issues/31844#issue-135807289]
> , primarily due to an [unresolved soundness
> hole|http://aturon.github.io/blog/2017/07/08/lifetime-dispatch]. (Note: there
> has been further discussion and ideas for resolving the soundness issue, but
> to my knowledge no definitive action.)
> If we can remove specialization from the Rust codebase, we will not be
> blocked on the Rust team's stabilization of that feature in order to move to
> stable Rust.
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