refactor: adds _compliant sub-package

narwhals/_arrow/dataframe.py

@@ -17,6 +17,7 @@
 from narwhals._arrow.utils import extract_dataframe_comparand
 from narwhals._arrow.utils import native_to_narwhals_dtype
 from narwhals._arrow.utils import select_rows
+from narwhals._compliant import EagerDataFrame
 from narwhals._expression_parsing import ExprKind
 from narwhals._expression_parsing import evaluate_into_exprs
 from narwhals.dependencies import is_numpy_array_1d
@@ -71,7 +72,7 @@
 from narwhals.typing import CompliantLazyFrame
 
 
-class ArrowDataFrame(CompliantDataFrame["ArrowSeries"], CompliantLazyFrame):
+class ArrowDataFrame(EagerDataFrame["ArrowSeries"], CompliantLazyFrame):
     # --- not in the spec ---
     def __init__(
         self: Self,
@@ -777,7 +778,7 @@ def unique(
 
         keep_idx = self.simple_select(*subset).is_unique()
         plx = self.__narwhals_namespace__()
-        return self.filter(plx._create_expr_from_series(keep_idx))
+        return self.filter(plx._expr._from_series(keep_idx))
 
     def gather_every(self: Self, n: int, offset: int) -> Self:
         return self._from_native_frame(