Method cast_to

datafusion/expr-common/src/columnar_value.rs:288–303

Cast this [ColumnarValue] to the specified `DataType` # Struct Casting Behavior When casting struct types, fields are matched **by name** rather than position: - Source fields are matched to target fields using case-sensitive name comparison - Fields are reordered to match the target schema - Missing target fields are filled with null arrays - Extra source fields are ignored For non-struct type

(
        &self,
        cast_type: &DataType,
        cast_options: Option<&CastOptions<'static>>,
    )

    ///
    /// For non-struct types, uses Arrow's standard positional casting.
    pub fn cast_to(
        &self,
        cast_type: &DataType,
        cast_options: Option<&CastOptions<'static>>,
    ) -> Result<ColumnarValue> {
        let cast_options = cast_options.cloned().unwrap_or(DEFAULT_CAST_OPTIONS);
        match self {
            ColumnarValue::Array(array) => {
                let casted = cast_array_by_name(array, cast_type, &cast_options)?;
                Ok(ColumnarValue::Array(casted))
            }
            ColumnarValue::Scalar(scalar) => Ok(ColumnarValue::Scalar(
                scalar.cast_to_with_options(cast_type, &cast_options)?,
            )),
        }
    }
}

fn cast_array_by_name(