33 lines
1 KiB
Python
33 lines
1 KiB
Python
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from __future__ import annotations
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from typing import TYPE_CHECKING
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from narwhals._sql.group_by import SQLGroupBy
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if TYPE_CHECKING:
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from collections.abc import Sequence
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import ibis.expr.types as ir # noqa: F401
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from narwhals._ibis.dataframe import IbisLazyFrame
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from narwhals._ibis.expr import IbisExpr
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class IbisGroupBy(SQLGroupBy["IbisLazyFrame", "IbisExpr", "ir.Value"]):
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def __init__(
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self,
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df: IbisLazyFrame,
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keys: Sequence[str] | Sequence[IbisExpr],
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/,
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*,
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drop_null_keys: bool,
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) -> None:
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frame, self._keys, self._output_key_names = self._parse_keys(df, keys=keys)
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self._compliant_frame = frame.drop_nulls(self._keys) if drop_null_keys else frame
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def agg(self, *exprs: IbisExpr) -> IbisLazyFrame:
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native = self.compliant.native
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return self.compliant._with_native(
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native.group_by(self._keys).aggregate(*self._evaluate_exprs(exprs))
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).rename(dict(zip(self._keys, self._output_key_names)))
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