vtlim commented on code in PR #13819:
URL: https://github.com/apache/druid/pull/13819#discussion_r1120990146
##########
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 sum for each metric value
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:
```suggestion
For each key-value pair in the given ArrayOfDoublesSketch, this post
aggregator estimates the sum of the values associated with the key. The post
aggregator returns _N_ double values, where _N_ is the number of double values
associated with each key.
```
Based on the example in
https://github.com/apache/druid/pull/13819#discussion_r1115305144, if the sum
is done for each key (row-wise), then I think we should say `_N_ is the number
of keys in the ArrayOfDoublesSketch` but if the sum is done across different
keys (column-wise), then the description for _N_ is fine as is.
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