1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
|
from __future__ import annotations
from typing import TYPE_CHECKING, Sequence
from narwhals._compliant import LazyGroupBy
if TYPE_CHECKING:
import ibis.expr.types as ir # noqa: F401
from narwhals._ibis.dataframe import IbisLazyFrame
from narwhals._ibis.expr import IbisExpr
class IbisGroupBy(LazyGroupBy["IbisLazyFrame", "IbisExpr", "ir.Value"]):
def __init__(
self,
df: IbisLazyFrame,
keys: Sequence[str] | Sequence[IbisExpr],
/,
*,
drop_null_keys: bool,
) -> None:
frame, self._keys, self._output_key_names = self._parse_keys(df, keys=keys)
self._compliant_frame = frame.drop_nulls(self._keys) if drop_null_keys else frame
def agg(self, *exprs: IbisExpr) -> IbisLazyFrame:
native = self.compliant.native
return self.compliant._with_native(
native.group_by(self._keys).aggregate(*self._evaluate_exprs(exprs))
).rename(dict(zip(self._keys, self._output_key_names)))
|
