[ https://issues.apache.org/jira/browse/ARROW-10002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kyle Strand reopened ARROW-10002: --------------------------------- My first PR only removes {{default fn}} from one trait. > [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 > 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. -- This message was sent by Atlassian Jira (v8.3.4#803005)