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feat: add `Selector.xor` and `Expr.xor` for symmetric difference - #3621

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SAY-5 wants to merge 9 commits into

narwhals-dev:mainfrom

SAY-5:feat/selector-xor

Commits on May 19, 2026
- feat(selectors): add `Selector.__xor__` for symmetric difference
  SAY-5
  committed
  81c6263
- fix(selectors): resolve typing and coverage CI failures on __xor__
  SAY-5
  committed
  35e9fcf
Commits on May 20, 2026
- feat(expr): add __xor__ for symmetric difference
  SAY-5
  committed
  c8e6cf9
- Merge branch 'main' into feat/selector-xor
  FBruzzesi
  authored
  94d6214
- fix(polars): emulate pre-1.0 Selector.__xor__ via column set diff
  SAY-5
  committed
  1cb834e
Commits on May 21, 2026
- fix(typing): use getattr for polars selector_proxy and method form for sql xor
  SAY-5
  committed
  dd5f155
Commits on May 25, 2026
- fix(typing): add type: ignore[override] to Selector.__xor__
  SAY-5
  committed
  b742f41
- Merge branch 'main' into feat/selector-xor
  FBruzzesi
  authored
  e56006d
Commits on Jun 9, 2026
- fix(selectors): fall back to Expr for Selector.__xor__ with non-selectors
  SAY-5
  committed
  2e943a2