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from __future__ import annotations
from typing import TYPE_CHECKING, Sequence
from duckdb import FunctionExpression
from narwhals._duckdb.utils import UNITS_DICT, fetch_rel_time_zone, lit
from narwhals._duration import parse_interval_string
from narwhals._utils import not_implemented
if TYPE_CHECKING:
from duckdb import Expression
from narwhals._duckdb.dataframe import DuckDBLazyFrame
from narwhals._duckdb.expr import DuckDBExpr
class DuckDBExprDateTimeNamespace:
def __init__(self, expr: DuckDBExpr) -> None:
self._compliant_expr = expr
def year(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("year", expr)
)
def month(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("month", expr)
)
def day(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("day", expr)
)
def hour(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("hour", expr)
)
def minute(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("minute", expr)
)
def second(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("second", expr)
)
def millisecond(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("millisecond", expr)
- FunctionExpression("second", expr) * lit(1_000)
)
def microsecond(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("microsecond", expr)
- FunctionExpression("second", expr) * lit(1_000_000)
)
def nanosecond(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("nanosecond", expr)
- FunctionExpression("second", expr) * lit(1_000_000_000)
)
def to_string(self, format: str) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("strftime", expr, lit(format))
)
def weekday(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("isodow", expr)
)
def ordinal_day(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("dayofyear", expr)
)
def date(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(lambda expr: expr.cast("date"))
def total_minutes(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: FunctionExpression("datepart", lit("minute"), expr)
)
def total_seconds(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: lit(60) * FunctionExpression("datepart", lit("minute"), expr)
+ FunctionExpression("datepart", lit("second"), expr)
)
def total_milliseconds(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: lit(60_000) * FunctionExpression("datepart", lit("minute"), expr)
+ FunctionExpression("datepart", lit("millisecond"), expr)
)
def total_microseconds(self) -> DuckDBExpr:
return self._compliant_expr._with_callable(
lambda expr: lit(60_000_000)
* FunctionExpression("datepart", lit("minute"), expr)
+ FunctionExpression("datepart", lit("microsecond"), expr)
)
def truncate(self, every: str) -> DuckDBExpr:
multiple, unit = parse_interval_string(every)
if multiple != 1:
# https://github.com/duckdb/duckdb/issues/17554
msg = f"Only multiple 1 is currently supported for DuckDB.\nGot {multiple!s}."
raise ValueError(msg)
if unit == "ns":
msg = "Truncating to nanoseconds is not yet supported for DuckDB."
raise NotImplementedError(msg)
format = lit(UNITS_DICT[unit])
def _truncate(expr: Expression) -> Expression:
return FunctionExpression("date_trunc", format, expr)
return self._compliant_expr._with_callable(_truncate)
def _no_op_time_zone(self, time_zone: str) -> DuckDBExpr:
def func(df: DuckDBLazyFrame) -> Sequence[Expression]:
native_series_list = self._compliant_expr(df)
conn_time_zone = fetch_rel_time_zone(df.native)
if conn_time_zone != time_zone:
msg = (
"DuckDB stores the time zone in the connection, rather than in the "
f"data type, so changing the timezone to anything other than {conn_time_zone} "
" (the current connection time zone) is not supported."
)
raise NotImplementedError(msg)
return native_series_list
return self._compliant_expr.__class__(
func,
evaluate_output_names=self._compliant_expr._evaluate_output_names,
alias_output_names=self._compliant_expr._alias_output_names,
backend_version=self._compliant_expr._backend_version,
version=self._compliant_expr._version,
)
def convert_time_zone(self, time_zone: str) -> DuckDBExpr:
return self._no_op_time_zone(time_zone)
def replace_time_zone(self, time_zone: str | None) -> DuckDBExpr:
if time_zone is None:
return self._compliant_expr._with_callable(
lambda _input: _input.cast("timestamp")
)
else:
return self._no_op_time_zone(time_zone)
total_nanoseconds = not_implemented()
|
