Function datafusion::physical_plan::functions::make_scalar_function

pub fn make_scalar_function<F>(
    inner: F
) -> Arc<dyn Fn(&[ColumnarValue]) -> Result<ColumnarValue, DataFusionError> + Sync + Send, Global>where
    F: Fn(&[Arc<dyn Array, Global>]) -> Result<Arc<dyn Array, Global>, DataFusionError> + Sync + Send + 'static,

decorates a function to handle ScalarValues by converting them to arrays before calling the function and vice-versa after evaluation.