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Posted to jira@arrow.apache.org by "Kyle Strand (Jira)" <ji...@apache.org> on 2020/09/14 17:15:00 UTC
[jira] [Updated] (ARROW-10002) [Rust] Trait-specialization requries
nightly
[ https://issues.apache.org/jira/browse/ARROW-10002?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kyle Strand updated ARROW-10002:
--------------------------------
Description:
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.
was:
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.
> [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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