Function combine_gaussians 

pub fn combine_gaussians(
    op: &Operator,
    left: &GaussianDistribution,
    right: &GaussianDistribution,
) -> Result<Option<GaussianDistribution>, DataFusionError>

👎Deprecated since 54.0.0:

Part of the unused Statistics V2 framework; see https://github.com/apache/datafusion/pull/22071

Applies the given operation to the given Gaussian distributions. Currently, this function handles only addition and subtraction operations. If the result is not a Gaussian random variable, it returns None. For details, see:

https://en.wikipedia.org/wiki/Sum_of_normally_distributed_random_variables