good stuff

server-rs/src/aggregation.rs

@@ -52,6 +52,23 @@ impl Aggregator {
         }
     }
 
+    /// Merge another aggregator's results into this one.
+    pub fn merge(&mut self, other: &Aggregator) {
+        self.count += other.count;
+        for i in 0..self.mins.len() {
+            if other.feat_counts[i] > 0 {
+                if other.mins[i] < self.mins[i] {
+                    self.mins[i] = other.mins[i];
+                }
+                if other.maxs[i] > self.maxs[i] {
+                    self.maxs[i] = other.maxs[i];
+                }
+                self.sums[i] += other.sums[i];
+                self.feat_counts[i] += other.feat_counts[i];
+            }
+        }
+    }
+
     /// Add a row, only aggregating the features at the given indices.
     #[inline]
     pub fn add_row_selective(