218 lines
7.5 KiB
Python
218 lines
7.5 KiB
Python
from __future__ import annotations
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import operator
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from functools import reduce
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from typing import TYPE_CHECKING, Any
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from narwhals._expression_parsing import (
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combine_alias_output_names,
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combine_evaluate_output_names,
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)
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from narwhals._spark_like.dataframe import SparkLikeLazyFrame
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from narwhals._spark_like.expr import SparkLikeExpr
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from narwhals._spark_like.selectors import SparkLikeSelectorNamespace
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from narwhals._spark_like.utils import (
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import_functions,
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import_native_dtypes,
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narwhals_to_native_dtype,
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true_divide,
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)
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from narwhals._sql.namespace import SQLNamespace
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from narwhals._sql.when_then import SQLThen, SQLWhen
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if TYPE_CHECKING:
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from collections.abc import Iterable
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from sqlframe.base.column import Column
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from narwhals._spark_like.dataframe import SQLFrameDataFrame # noqa: F401
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from narwhals._utils import Implementation, Version
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from narwhals.typing import ConcatMethod, IntoDType, NonNestedLiteral, PythonLiteral
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class SparkLikeNamespace(
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SQLNamespace[SparkLikeLazyFrame, SparkLikeExpr, "SQLFrameDataFrame", "Column"]
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):
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def __init__(self, *, version: Version, implementation: Implementation) -> None:
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self._version = version
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self._implementation = implementation
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@property
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def selectors(self) -> SparkLikeSelectorNamespace:
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return SparkLikeSelectorNamespace.from_namespace(self)
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@property
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def _expr(self) -> type[SparkLikeExpr]:
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return SparkLikeExpr
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@property
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def _lazyframe(self) -> type[SparkLikeLazyFrame]:
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return SparkLikeLazyFrame
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@property
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def _F(self): # type: ignore[no-untyped-def] # noqa: ANN202, N802
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if TYPE_CHECKING:
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from sqlframe.base import functions
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return functions
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else:
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return import_functions(self._implementation)
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@property
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def _native_dtypes(self): # type: ignore[no-untyped-def] # noqa: ANN202
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if TYPE_CHECKING:
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from sqlframe.base import types
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return types
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else:
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return import_native_dtypes(self._implementation)
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def _function(self, name: str, *args: Column | PythonLiteral) -> Column:
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return getattr(self._F, name)(*args)
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def _lit(self, value: Any) -> Column:
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return self._F.lit(value)
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def _when(self, condition: Column, value: Column) -> Column:
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return self._F.when(condition, value)
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def _coalesce(self, *exprs: Column) -> Column:
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return self._F.coalesce(*exprs)
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def lit(self, value: NonNestedLiteral, dtype: IntoDType | None) -> SparkLikeExpr:
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def _lit(df: SparkLikeLazyFrame) -> list[Column]:
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column = df._F.lit(value)
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if dtype:
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native_dtype = narwhals_to_native_dtype(
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dtype, self._version, df._native_dtypes, df.native.sparkSession
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)
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column = column.cast(native_dtype)
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return [column]
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return self._expr(
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call=_lit,
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evaluate_output_names=lambda _df: ["literal"],
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alias_output_names=None,
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version=self._version,
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implementation=self._implementation,
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)
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def len(self) -> SparkLikeExpr:
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def func(df: SparkLikeLazyFrame) -> list[Column]:
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return [df._F.count("*")]
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return self._expr(
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func,
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evaluate_output_names=lambda _df: ["len"],
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alias_output_names=None,
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version=self._version,
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implementation=self._implementation,
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)
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def mean_horizontal(self, *exprs: SparkLikeExpr) -> SparkLikeExpr:
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def func(cols: Iterable[Column]) -> Column:
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cols = list(cols)
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F = exprs[0]._F # noqa: N806
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numerator = reduce(
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operator.add, (self._F.coalesce(col, self._F.lit(0)) for col in cols)
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)
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denominator = reduce(
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operator.add,
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(col.isNotNull().cast(self._native_dtypes.IntegerType()) for col in cols),
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)
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return true_divide(F, numerator, denominator)
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return self._expr._from_elementwise_horizontal_op(func, *exprs)
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def concat(
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self, items: Iterable[SparkLikeLazyFrame], *, how: ConcatMethod
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) -> SparkLikeLazyFrame:
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dfs = [item._native_frame for item in items]
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if how == "vertical":
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cols_0 = dfs[0].columns
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for i, df in enumerate(dfs[1:], start=1):
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cols_current = df.columns
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if not ((len(cols_current) == len(cols_0)) and (cols_current == cols_0)):
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msg = (
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"unable to vstack, column names don't match:\n"
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f" - dataframe 0: {cols_0}\n"
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f" - dataframe {i}: {cols_current}\n"
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)
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raise TypeError(msg)
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return SparkLikeLazyFrame(
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native_dataframe=reduce(lambda x, y: x.union(y), dfs),
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version=self._version,
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implementation=self._implementation,
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)
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if how == "diagonal":
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return SparkLikeLazyFrame(
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native_dataframe=reduce(
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lambda x, y: x.unionByName(y, allowMissingColumns=True), dfs
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),
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version=self._version,
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implementation=self._implementation,
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)
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raise NotImplementedError
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def concat_str(
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self, *exprs: SparkLikeExpr, separator: str, ignore_nulls: bool
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) -> SparkLikeExpr:
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def func(df: SparkLikeLazyFrame) -> list[Column]:
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cols = [s for _expr in exprs for s in _expr(df)]
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cols_casted = [s.cast(df._native_dtypes.StringType()) for s in cols]
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null_mask = [df._F.isnull(s) for s in cols]
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if not ignore_nulls:
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null_mask_result = reduce(operator.or_, null_mask)
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result = df._F.when(
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~null_mask_result,
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reduce(
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lambda x, y: df._F.format_string(f"%s{separator}%s", x, y),
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cols_casted,
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),
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).otherwise(df._F.lit(None))
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else:
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init_value, *values = [
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df._F.when(~nm, col).otherwise(df._F.lit(""))
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for col, nm in zip(cols_casted, null_mask)
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]
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separators = (
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df._F.when(nm, df._F.lit("")).otherwise(df._F.lit(separator))
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for nm in null_mask[:-1]
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)
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result = reduce(
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lambda x, y: df._F.format_string("%s%s", x, y),
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(
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df._F.format_string("%s%s", s, v)
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for s, v in zip(separators, values)
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),
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init_value,
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)
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return [result]
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return self._expr(
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call=func,
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evaluate_output_names=combine_evaluate_output_names(*exprs),
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alias_output_names=combine_alias_output_names(*exprs),
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version=self._version,
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implementation=self._implementation,
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)
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def when(self, predicate: SparkLikeExpr) -> SparkLikeWhen:
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return SparkLikeWhen.from_expr(predicate, context=self)
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class SparkLikeWhen(SQLWhen[SparkLikeLazyFrame, "Column", SparkLikeExpr]):
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@property
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def _then(self) -> type[SparkLikeThen]:
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return SparkLikeThen
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class SparkLikeThen(
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SQLThen[SparkLikeLazyFrame, "Column", SparkLikeExpr], SparkLikeExpr
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): ...
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