pchintar commented on code in PR #22774:
URL: https://github.com/apache/datafusion/pull/22774#discussion_r3367427089


##########
datafusion/sqllogictest/test_files/aggregate.slt:
##########
@@ -6266,6 +6266,40 @@ GROUP BY g
 ----
 0 0
 
+# query_with_untyped_null_filter
+query I
+SELECT count(*) FILTER (WHERE NULL)
+----
+0
+
+query I
+SELECT count(1) FILTER (WHERE NULL)
+----
+0
+
+query I
+SELECT sum(1) FILTER (WHERE NULL)
+----
+NULL
+
+query R
+SELECT avg(1) FILTER (WHERE NULL)
+----
+NULL
+
+# window_aggregate_with_untyped_null_filter
+query I
+SELECT count(*) FILTER (WHERE NULL) OVER ()
+FROM (VALUES (1)) AS t(x)
+----
+0
+
+query I
+SELECT sum(1) FILTER (WHERE NULL) OVER ()
+FROM (VALUES (1)) AS t(x)
+----
+NULL
+

Review Comment:
   Thanks @nuno-faria , and thanks for checking the predicate behavior against 
DuckDB/Postgres too.
   
   I put these in aggregate.slt because the failure is in aggregate FILTER 
handling and there are already related aggregate/window aggregate cases here.



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