vtlim commented on code in PR #13819:
URL: https://github.com/apache/druid/pull/13819#discussion_r1120990962
##########
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
+
+This post aggregator adds a Base64-encoded constant ArrayOfDoublesSketch value
that you can use in other post aggregators.
+```json
+{
+ "type": "arrayOfDoublesSketchConstant",
+ "name": DESTINATION_COLUMN_NAME,
+ "value": CONSTANT_SKETCH_VALUE
+}
+```
+
+### Base64 output of ArrayOfDoublesSketch
+
+This post aggregator outputs an ArrayOfDoublesSketch as a Base64-encoded
string storing the constant tuple sketch value that you can 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
+
+This post aggregator returns a list of estimated values(sum) from a given
ArrayOfDoublesSketch. The result is _N_ double values, where _N_ is the number
of double values kept in the sketch per key.
Review Comment:
Sorry, just saw this. The example isn't clear to me; is the sum being added
row-wise or column-wise?
For this example,
```
Key_1, {1.0, 3.0}
Key_2, {2.0, 5.0}
```
Would the result be `{3.0, 8.0}` or `{4.0, 7.0}`?
Commented a suggestion in
https://github.com/apache/druid/pull/13819/files?file-filters%5B%5D=.md&show-viewed-files=true#r1120990146.
It would be great to include this example in the docs as well.
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