xudong963 commented on code in PR #15296:
URL: https://github.com/apache/datafusion/pull/15296#discussion_r2007748334
##########
datafusion/expr-common/src/statistics.rs:
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@@ -203,6 +203,138 @@ impl Distribution {
};
Ok(dt)
}
+
+ /// Merges two distributions into a single distribution that represents
their combined statistics.
+ /// This creates a more general distribution that approximates the mixture
of the input distributions.
+ ///
+ /// # Important Notes
+ ///
+ /// - The resulting mean, median, and variance are approximations of the
mixture
+ /// distribution parameters. They are calculated using weighted averages
based on
+ /// the input distributions. Users should not make definitive
assumptions based on these values.
Review Comment:
I agree, this will result in larger uncertainties.
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