done

lib/python3.11/site-packages/narwhals/_duckdb/selectors.py

@@ -0,0 +1,33 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from narwhals._compliant import CompliantSelector, LazySelectorNamespace
+from narwhals._duckdb.expr import DuckDBExpr
+
+if TYPE_CHECKING:
+    from duckdb import Expression  # noqa: F401
+
+    from narwhals._duckdb.dataframe import DuckDBLazyFrame  # noqa: F401
+    from narwhals._duckdb.expr import DuckDBWindowFunction
+
+
+class DuckDBSelectorNamespace(LazySelectorNamespace["DuckDBLazyFrame", "Expression"]):
+    @property
+    def _selector(self) -> type[DuckDBSelector]:
+        return DuckDBSelector
+
+
+class DuckDBSelector(  # type: ignore[misc]
+    CompliantSelector["DuckDBLazyFrame", "Expression"], DuckDBExpr
+):
+    _window_function: DuckDBWindowFunction | None = None
+
+    def _to_expr(self) -> DuckDBExpr:
+        return DuckDBExpr(
+            self._call,
+            self._window_function,
+            evaluate_output_names=self._evaluate_output_names,
+            alias_output_names=self._alias_output_names,
+            version=self._version,
+        )