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feat(map datatype): use narwhals-map when Map datatype is enabled - #1167
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…#1167) ## Summary Implement backend-agnostic `Map` datatype support with [`narwhals-map`](https://pypi.org/project/narwhals-map/). ## Changelog [`narwhals-map`](https://pypi.org/project/narwhals-map/) is now used for `Map` datatype operations in Narwhals. This changes the Narwhals datatype from `Unknown` to `narwhals_map.Map` and exposes `nw.Expr.map` namespace for these columns. ## Test Plan Existing tests + new tests for I/O with `narwhals_map.Map` columns.
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Summary
Implement backend-agnostic
Mapdatatype support withnarwhals-map.Changelog
narwhals-mapis now used forMapdatatype operations in Narwhals. This changes the Narwhals datatype fromUnknowntonarwhals_map.Mapand exposesnw.Expr.mapnamespace for these columns.Test Plan
Existing tests + new tests for I/O with
narwhals_map.Mapcolumns.