L041: Fix duplicate DISTINCT corruption

[jpy-git]

Brief summary of the change made

Closes #2363. Fixes the linked issue, and more generally simplifies, the rule logic using the functional API.

Are there any other side effects of this change that we should be aware of?

No

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/dialects (note YML files can be auto generated with tox -e generate-fixture-yml).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[tunetheweb]

LGTM! Nice clean up.

[codecov]

Codecov Report

Merging #2365 (eb99487) into main (c2b2c60) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main     #2365   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          161       161           
  Lines        11464     11464           
=========================================
  Hits         11464     11464           

Impacted Files	Coverage Δ
src/sqlfluff/rules/L041.py	100.00% <100.00%> (ø)

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