[GitHub] [druid] suneet-s commented on a change in pull request #10285: Add note about aggregations on floats

[GitBox <gi...@apache.org>]

suneet-s commented on a change in pull request #10285:
URL: https://github.com/apache/druid/pull/10285#discussion_r471665827



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File path: docs/development/extensions-core/stats.md
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@@ -44,6 +44,13 @@ This algorithm was proven to be numerically stable by J.L. Barlow in
 "Error analysis of a pairwise summation algorithm to compute sample variance"
 Numer. Math, 58 (1991) pp. 583--590
 
+> As with all [aggregators](../../querying/sql.md#aggregation-functions), the order of operations across segments is
+> non-deterministic. This means that if this aggregator operates with an input type of "float" or "double", the result
+> of the aggregation will not be precisely the same across multiple runs of the query.

Review comment:
       ```suggestion
   > of the aggregation may not be precisely the same across multiple runs of the query.
   ```




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