pola-rs/polars · error

could not cast

Error message

could not cast

What it means

Error "could not cast" thrown in pola-rs/polars.

Source

Thrown at crates/polars-core/src/series/arithmetic/borrowed.rs:835

impl<T> Rem<T> for Series
where
    T: Num + NumCast,
{
    type Output = Self;

    fn rem(self, rhs: T) -> Self::Output {
        (&self).rem(rhs)
    }
}

/// We cannot override the left hand side behaviour. So we create a trait LhsNumOps.
/// This allows for 1.add(&Series)
///
impl<T: PolarsNumericType> ChunkedArray<T> {
    /// Apply lhs - self
    #[must_use]
    pub fn lhs_sub<N: Num + NumCast>(&self, lhs: N) -> Self {
        let lhs: T::Native = NumCast::from(lhs).expect("could not cast");
        ArithmeticChunked::wrapping_sub_scalar_lhs(lhs, self)
    }

    /// Apply lhs / self
    #[must_use]
    pub fn lhs_div<N: Num + NumCast>(&self, lhs: N) -> Self {
        let lhs: T::Native = NumCast::from(lhs).expect("could not cast");
        ArithmeticChunked::legacy_div_scalar_lhs(lhs, self)
    }

    /// Apply lhs % self
    #[must_use]
    pub fn lhs_rem<N: Num + NumCast>(&self, lhs: N) -> Self {
        let lhs: T::Native = NumCast::from(lhs).expect("could not cast");
        ArithmeticChunked::wrapping_mod_scalar_lhs(lhs, self)
    }
}

View on GitHub (pinned to df599052da)

When it happens

Trigger: Thrown at crates/polars-core/src/series/arithmetic/borrowed.rs:835 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of pola-rs/polars@df599052da (2026-08-16). Data as JSON: /api/errors/6b10d56526d9af7e. Report an issue: GitHub.