fn subtract_year_months<T: ArrowTimestampType>(
timestamp: <T as ArrowPrimitiveType>::Native,
delta: <IntervalYearMonthType as ArrowPrimitiveType>::Native,
tz: Tz,
) -> Option<<T as ArrowPrimitiveType>::Native>
fn subtract_year_months<T: ArrowTimestampType>(
timestamp: <T as ArrowPrimitiveType>::Native,
delta: <IntervalYearMonthType as ArrowPrimitiveType>::Native,
tz: Tz,
) -> Option<<T as ArrowPrimitiveType>::Native>