iindyk commented on a change in pull request #12420:
URL: https://github.com/apache/beam/pull/12420#discussion_r468937924



##########
File path: sdks/python/apache_beam/transforms/stats.py
##########
@@ -576,17 +633,34 @@ def _interpolate(self, i_buffers, count, step, offset):
     weighted_element = next(sorted_elem)
     current = weighted_element[1]
     j = 0
-    while j < count:
-      target = j * step + offset
-      j = j + 1
-      try:
-        while current <= target:
-          weighted_element = next(sorted_elem)
-          current = current + weighted_element[1]
-      except StopIteration:
-        pass
-      new_elements.append(weighted_element[0])
-    return new_elements
+    if self._weighted:

Review comment:
       I tried to avoid affecting the performance of the existing codepath, but 
after a closer look I think the overhead caused by the if in the loop is 
negligible compared to the time taken by the inner loop and append. Merged the 
branches.




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