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https://issues.apache.org/jira/browse/ARROW-10002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17195638#comment-17195638
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Andy Grove commented on ARROW-10002:
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Thanks [~batmanaod] this looks really interesting.
[~paddyhoran] [~nevime] [~sunchao] [~alamb] [~jorgecarleitao] [~jhorstmann]
will likely be interested in this
> [Rust] Trait-specialization requries 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
>
> 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.)|http://aturon.github.io/tech/2017/07/08/lifetime-dispatch/].]
> 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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