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fix: support `with_columns` on completely empty `DataFrame`s - #4046

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rohanz wants to merge 4 commits into

narwhals-dev:mainfrom

rohanz:fix/with-columns-empty-eager-frame-3012

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fix: support `with_columns` on completely empty `DataFrame`s#4046
rohanz wants to merge 4 commits into
narwhals-dev:mainfrom
rohanz:fix/with-columns-empty-eager-frame-3012

Commits on Oct 8, 2026
- fix: support `with_columns` on eager frames with no rows and no columns
  
  rohanz
  and
  claude
  committed
  835262e
- fix: keep frame metadata when `with_columns` gets no expressions on an empty frame
  
  rohanz
  and
  claude
  committed
  4486c43
- fix: preserve metadata and duplicate semantics on empty frames
  
  rohanz
  and
  codex
  committed
  a270bf3
- test: explain optional backend requirements in empty-frame tests
  rohanz
  committed
  ab3c283