feat: Basic implementation of cell with polars

src/safeds/data/tabular/containers/_experimental_lazy_column.py

@@ -0,0 +1,10 @@
+# TODO: polars expressions get optimized first, before being applied. For further performance improvements (if needed),
+#  we should mirror this when transitioning from a vectorized row to a cell.
+
+from abc import ABC
+
+from safeds.data.tabular.containers import ExperimentalPolarsCell
+
+
+class _LazyColumn(ExperimentalPolarsCell, ABC):
+    pass

src/safeds/data/tabular/containers/_experimental_polars_cell.py

@@ -1,10 +1,122 @@
 from __future__ import annotations
 
-from abc import ABC
-from typing import Generic, TypeVar
+from abc import ABC, abstractmethod
+from typing import Any, Generic, TypeVar
 
 T = TypeVar("T")
+P = TypeVar("P")
+R = TypeVar("R")
 
 
 class ExperimentalPolarsCell(ABC, Generic[T]):
-    pass
+    """A cell is a single value in a table."""
+
+    # ------------------------------------------------------------------------------------------------------------------
+    # Dunder methods
+    # ------------------------------------------------------------------------------------------------------------------
+
+    # "Boolean" operators (actually bitwise) -----------------------------------
+
+    @abstractmethod
+    def __invert__(self) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __and__(self, other: bool | ExperimentalPolarsCell[bool]) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __rand__(self, other: bool | ExperimentalPolarsCell[bool]) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __or__(self, other: bool | ExperimentalPolarsCell[bool]) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __ror__(self, other: bool | ExperimentalPolarsCell[bool]) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __xor__(self, other: bool | ExperimentalPolarsCell[bool]) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __rxor__(self, other: bool | ExperimentalPolarsCell[bool]) -> ExperimentalPolarsCell[bool]: ...
+
+    # Comparison ---------------------------------------------------------------
+
+    @abstractmethod
+    def __eq__(self, other: object) -> ExperimentalPolarsCell[bool]:  # type: ignore[override]
+        ...
+
+    @abstractmethod
+    def __ge__(self, other: Any) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __gt__(self, other: Any) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __le__(self, other: Any) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __lt__(self, other: Any) -> ExperimentalPolarsCell[bool]: ...
+
+    @abstractmethod
+    def __ne__(self, other: object) -> ExperimentalPolarsCell[bool]:  # type: ignore[override]
+        ...
+
+    # Numeric operators --------------------------------------------------------
+
+    @abstractmethod
+    def __abs__(self) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __neg__(self) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __pos__(self) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __add__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __radd__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __floordiv__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __rfloordiv__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __mod__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __rmod__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __mul__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __rmul__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __pow__(self, other: float | ExperimentalPolarsCell[P]) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __rpow__(self, other: float | ExperimentalPolarsCell[P]) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __sub__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __rsub__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __truediv__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    @abstractmethod
+    def __rtruediv__(self, other: Any) -> ExperimentalPolarsCell[R]: ...
+
+    # Other --------------------------------------------------------------------
+
+    @abstractmethod
+    def __hash__(self) -> int: ...
+
+    @abstractmethod
+    def __sizeof__(self) -> int: ...