Trait Decimal128Encode 

pub trait Decimal128Encode {
    // Required method
    fn try_to_i128_mantissa(&self, target_scale: u32) -> Option<i128>;
}

Encodes a decimal value into the i128 mantissa expected by polars DataType::Decimal(_, _) columns.

Implementations MUST use round-half-to-even (banker’s rounding) on scale-down so the mantissa bytes match what polars’s own str_to_dec128 would produce. Returning None indicates the rescaled value does not fit in i128; the caller (the df-derive codegen) surfaces this as a PolarsError::ComputeError.

Required Methods

fn try_to_i128_mantissa(&self, target_scale: u32) -> Option<i128>

Returns the mantissa as i128 after rescaling self to target_scale, or None if the scale exceeds polars decimal precision or the conversion would overflow.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl Decimal128Encode for QuantityAmount

Available on crate feature dataframe only.

impl<T> Decimal128Encode for T

where T: Decimal128Mantissa,