liuyongvs commented on code in PR #21993:
URL: https://github.com/apache/flink/pull/21993#discussion_r1116965989


##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/SpecificInputTypeStrategies.java:
##########
@@ -71,7 +71,11 @@ public final class SpecificInputTypeStrategies {
 
     /** Argument type derived from the array element type. */
     public static final ArgumentTypeStrategy ARRAY_ELEMENT_ARG =
-            new ArrayElementArgumentTypeStrategy();
+            new ArrayElementArgumentTypeStrategy(false);
+
+    /** Argument type derived from the array element type. But leaves 
nullability untouched. */

Review Comment:
   the reason why i add ARRAY_ELEMENT_ARG and ARRAY_ELEMENT_ARG_NULLABLE like 
COMMON_ARG/COMMON_ARG_NULLABLE is some  array function may need element arg not 
null. so i preserve.



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