lostluck commented on code in PR #17716:
URL: https://github.com/apache/beam/pull/17716#discussion_r877216368


##########
sdks/go/pkg/beam/core/runtime/exec/datasource.go:
##########
@@ -348,6 +348,18 @@ func (n *DataSource) makeEncodeElms() func([]*FullValue) 
([][]byte, error) {
        return encodeElms
 }
 
+func getRTrackerFromRoot(root *FullValue) (sdf.BoundableRTracker, float64, 
bool) {
+       tracker, ok := 
root.Elm.(*FullValue).Elm2.(*FullValue).Elm.(sdf.BoundableRTracker)
+       if !ok {
+               return nil, -1.0, false
+       }
+       size, ok := root.Elm2.(float64)
+       if !ok {

Review Comment:
   Consider adding a small reminder comment what the expected format and 
representation of the FullValue here is. eg. KV<KV<...,...>, Size>  (fill in 
the ...).



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