GH-14734: [R] Deprecated filter + across usage

[thisisnic]

Rationale for this change

Wanna match deprecation of functions that dplyr has

What changes are included in this PR?

Warn when using across i filter

Are these changes tested?

Yeah

Are there any user-facing changes?

Yeah

• GitHub Issue: [R] Deprecated filter + across usage #14734

[github-actions]

⚠️ GitHub issue #14734 has been automatically assigned in GitHub to PR creator.

[Copilot]

🟢 Approval recommended

The warning behavior is implemented consistently with existing Arrow R deprecation patterns and is covered by targeted testthat expectations.

Pull request overview

This PR aligns Arrow R’s dplyr backend with dplyr’s deprecation of using across() inside filter() by emitting a lifecycle-style deprecation warning (also applied to Arrow’s filter_out() helper).

Changes:

• Detect across() calls passed to filter() / filter_out() and emit a lifecycle_warning_deprecated warning (rate-limited via rlang::warn(.frequency = "regularly")).
• Add test coverage asserting the warning message and class for both filter() and filter_out().

File summaries

File	Description
r/R/dplyr-filter.R	Adds deprecation warning when across() is used as a filter()/filter_out() predicate, then proceeds with existing expand_across() behavior.
r/tests/testthat/test-dplyr-filter.R	Adds tests verifying the warning message and warning class for filter(across(...)) and filter_out(across(...)).

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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