Vamsi-klu commented on code in PR #58038:
URL: https://github.com/apache/spark/pull/58038#discussion_r3797384496


##########
docs/sql-ref-null-semantics.md:
##########
@@ -273,6 +273,15 @@ SELECT count(age) FROM person;
 |         5|
 +----------+
 
+-- `count(DISTINCT age)` also skips `NULL`. A null group is not a distinct 
counted value.
+-- This is different from GROUP BY / SELECT DISTINCT, which put all nulls in 
one bucket.

Review Comment:
   Good call. I dropped that extra sentence and used your wording.



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