frankgrimes97 commented on code in PR #13887:
URL: https://github.com/apache/druid/pull/13887#discussion_r1142455315


##########
docs/querying/sql-aggregations.md:
##########
@@ -139,6 +139,16 @@ Load the [DataSketches 
extension](../development/extensions-core/datasketches-ex
 |`DS_QUANTILES_SKETCH(expr, [k])`|Creates a [Quantiles 
sketch](../development/extensions-core/datasketches-quantiles.md) on the values 
of `expr`, which can be a regular column or a column containing quantiles 
sketches. The `k` parameter is described in the Quantiles sketch 
documentation.<br/><br/>See the [known 
issue](sql-translation.md#approximations) with this function.|`'0'` (STRING)|
 
 
+### Tuple sketch functions
+
+Load the [DataSketches 
extension](../development/extensions-core/datasketches-extension.md) to use the 
following functions.

Review Comment:
   I believe all the sketches in the `druid-datasketches` module are currently 
described in more detail at the linked page: 
https://github.com/apache/druid/blob/master/docs/development/extensions-core/datasketches-extension.md
   
   That page also already links to the [Apache 
DataSketches](https://datasketches.apache.org/) project page which has its own 
extensive documentation. Is that not sufficient?



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