alamb commented on code in PR #15645:
URL: https://github.com/apache/datafusion/pull/15645#discussion_r2034037213
##########
datafusion/common/src/stats.rs:
##########
@@ -414,6 +414,53 @@ impl Statistics {
self.total_byte_size = Precision::Absent;
Ok(self)
}
+
+ /// Summarize zero or more statistics into a single `Statistics` instance.
+ pub fn merge_iter<'a, I>(items: I, schema: &Schema) -> Statistics
+ where
+ I: IntoIterator<Item = &'a Statistics>,
+ {
+ let mut items = items.into_iter();
+
+ let Some(init) = items.next() else {
+ return Statistics::new_unknown(schema);
+ };
+
+ items.fold(init.clone(), |acc: Statistics, item_stats: &Statistics| {
+ acc.merge(item_stats)
+ })
+ }
+
+ /// Merge this Statistics value with another Statistics value.
Review Comment:
This is the core logic for merging statistics code.
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