[GitHub] [calcite] Jiabao-Sun commented on a diff in pull request #3430: [CALCITE-6008] ARRAY_AGG should returns ARRAY NULL when there's no input rows

[via GitHub]

Jiabao-Sun commented on code in PR #3430:
URL: https://github.com/apache/calcite/pull/3430#discussion_r1327999465


##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -9314,11 +9314,12 @@ private static void 
checkGroupConcatFuncFails(SqlOperatorFixture t) {
   }
 
   private static void checkArrayAggFunc(SqlOperatorFixture f) {
-    f.setFor(SqlLibraryOperators.ARRAY_CONCAT_AGG, VM_FENNEL, VM_JAVA);
+    f.setFor(SqlLibraryOperators.ARRAY_AGG, VM_FENNEL, VM_JAVA);

Review Comment:
   But I can't find any proper rules to verify that `ARRAY_AGG($0)` should 
returns  `ARRAY NULL` type.



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