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https://issues.apache.org/jira/browse/ARROW-10002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Neville Dipale resolved ARROW-10002.
------------------------------------
Resolution: Fixed
Issue resolved by pull request 8485
[https://github.com/apache/arrow/pull/8485]
> [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
> Assignee: Jorge Leitão
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.0.0
>
> Time Spent: 4h 50m
> 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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