richardstartin commented on code in PR #8683:
URL: https://github.com/apache/pinot/pull/8683#discussion_r870646383
##########
pinot-spi/src/main/java/org/apache/pinot/spi/trace/InvocationRecording.java:
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@@ -28,6 +28,15 @@
*/
public interface InvocationRecording {
+ /**
+ * Sets the upper bound for the number of groups in a group by evaluation,
along with the actual number of groups.
+ * The ratio of these two quantities indicates how efficient the group by
was, and if truncation has occurred.
Review Comment:
Perhaps, can I add that as a follow up if the data tracked here turns out
not be enough?
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