xudong963 commented on code in PR #15296:
URL: https://github.com/apache/datafusion/pull/15296#discussion_r2002296888
##########
datafusion/expr-common/src/statistics.rs:
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@@ -857,6 +857,143 @@ pub fn compute_variance(
ScalarValue::try_from(target_type)
}
+/// 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.
+pub fn merge_distributions(a: &Distribution, b: &Distribution) ->
Result<Distribution> {
Review Comment:
Yes, that's also what I wanted to do
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