anshu-makkar commented on code in PR #13819:
URL: https://github.com/apache/druid/pull/13819#discussion_r1113859215
##########
docs/development/extensions-core/datasketches-tuple.md:
##########
@@ -207,3 +207,39 @@ Returns a human-readable summary of a given
ArrayOfDoublesSketch. This is a stri
"field" : <post aggregator that refers to an ArrayOfDoublesSketch
(fieldAccess or another post aggregator)>
}
```
+
+
+### Constant ArrayOfDoublesSketch
+
+You can use the this post aggregator to add a Base64-encoded constant
ArrayOfDoublesSketch value for use in other post-aggregators.
+```json
+{
+ "type" : "arrayOfDoublesSketchConstant",
+ "name": DESTINATION_COLUMN_NAME,
+ "value" : CONSTANT_SKETCH_VALUE
+}
+```
+
+### Base64 Output of ArrayOfDoublesSketch
+
+You can use the this post aggregator to output an ArrayOfDoublesSketch as
Base64-encoded string constant tuple sketch value for use in other
post-aggregators.
+
+```json
+{
+ "type" : "arrayOfDoublesSketchToBase64String",
+ "name": DESTINATION_COLUMN_NAME,
+ "field" : <post aggregator that refers to a ArrayOfDoublesSketch
(fieldAccess or another post aggregator)>
+}
+```
+
+### Estimated Metrics values for each column of ArrayOfDoublesSketch
+
+You can use this post aggregator to return a list of estimated values(sum)
from a given ArrayOfDoublesSketch. The result will be N double values, where N
is the number of double values kept in the sketch per key.
Review Comment:
For each key in a `sketch`, there is an array of doubles, while calculating
the estimate, we are doing sum of the values.
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