ektravel commented on code in PR #14497:
URL: https://github.com/apache/druid/pull/14497#discussion_r1247207560


##########
docs/querying/aggregations.md:
##########
@@ -422,6 +389,121 @@ It is not possible to determine a priori how well this 
aggregator will behave fo
 
 For these reasons, we have deprecated this aggregator and recommend using the 
DataSketches Quantiles aggregator instead for new and existing use cases, 
although we will continue to support Approximate Histogram for backwards 
compatibility.
 
+
+## Expression aggregators
+
+### Expression aggregator
+
+Query time only aggregator that can aggregate results using [Druid 
expressions](./math-expr.md) functions to facilitate building custom functions.

Review Comment:
   I think it would be helpful to show the expression aggregator here. Similar 
to what you have for the JavaScript aggregator on line 478.



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