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https://issues.apache.org/jira/browse/ARROW-7692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
François Garillot updated ARROW-7692:
-------------------------------------
Description:
Several pattern matches can be rewritten directly using a combinator, e.g.
array's `{{value_as_date}}`, more succintly expressed as a `map`:
{{match self.value_as_datetime(i) {}}
{{ Some(datetime) => Some(datetime.date()),}}
{{ None => None,}}
{{ }}}
More importantly some of these matches obscure what the code is doing, e.g.
parquet column writer `{{read_fully}}`'s extraction of a mutable slice:
{{let actual_def_levels = match &mut def_levels {}}
{{ Some(ref mut vec) => Some(&mut vec[..]),}}
{{ None => None,}}
{{ };}}
which can be written, using `as_mut` and `map`, as:
{{let actual_def_levels = def_levels.as_mut().map(|vec| &mut vec[..]);}}
A large # of these are meant to be addressed in
[https://github.com/apache/arrow/pull/6292/files]
was:
Several pattern matches can be rewritten directly using a combinator, e.g.
array's `{{value_as_date}}`, more succintly expressed as a `map`:
{{match self.value_as_datetime(i) {}}
{{ Some(datetime) => Some(datetime.date()),}}
{{ None => None,}}
{{ }}}
More importantly some of these matches obscure what the code is doing, e.g.
parquet column writer `{{read_fully}}`'s extraction of a mutable slice:
{{ {{let actual_def_levels = match &mut def_levels {}}}}
{{ Some(ref mut vec) => Some(&mut vec[..]),}}
{{ None => None,}}
{{ };}}
which can be written, using `as_mut` and `map`, as:
{{let actual_def_levels = def_levels.as_mut().map(|vec| &mut vec[..]);}}
A large # of these are meant to be addressed in
[https://github.com/apache/arrow/pull/6292/files]
> [Rust] Several pattern matches are hard to read
> -----------------------------------------------
>
> Key: ARROW-7692
> URL: https://issues.apache.org/jira/browse/ARROW-7692
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Rust
> Reporter: François Garillot
> Priority: Minor
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> Several pattern matches can be rewritten directly using a combinator, e.g.
> array's `{{value_as_date}}`, more succintly expressed as a `map`:
> {{match self.value_as_datetime(i) {}}
> {{ Some(datetime) => Some(datetime.date()),}}
> {{ None => None,}}
> {{ }}}
> More importantly some of these matches obscure what the code is doing, e.g.
> parquet column writer `{{read_fully}}`'s extraction of a mutable slice:
> {{let actual_def_levels = match &mut def_levels {}}
> {{ Some(ref mut vec) => Some(&mut vec[..]),}}
> {{ None => None,}}
> {{ };}}
> which can be written, using `as_mut` and `map`, as:
> {{let actual_def_levels = def_levels.as_mut().map(|vec| &mut vec[..]);}}
> A large # of these are meant to be addressed in
> [https://github.com/apache/arrow/pull/6292/files]
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