hanyuzheng7 commented on code in PR #22917:
URL: https://github.com/apache/flink/pull/22917#discussion_r1247859173


##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/strategies/SpecificTypeStrategies.java:
##########
@@ -58,8 +58,12 @@ public final class SpecificTypeStrategies {
     /** See {@link ArrayTypeStrategy}. */
     public static final TypeStrategy ARRAY = new ArrayTypeStrategy();
 
-    /** See {@link ArrayElementOutputTypeStrategy}. */
-    public static final TypeStrategy ARRAY_ELEMENT = new 
ArrayElementOutputTypeStrategy();
+    /** Type strategy specific for array element. */
+    public static final TypeStrategy ARRAY_ELEMENT =
+            callContext ->
+                    Optional.of(

Review Comment:
   @liuyongvs How about this case?
   [ARRAY(INT NOT NULL) -> output: INT
   if use the code like I use before
   ```
   return ((CollectionDataType) callContext.getArgumentDataTypes().get(0))
                                       .getElementDataType());
   ```
   the answer will return 1 not null
   (https://github.com/apache/flink/pull/22730#discussion_r1242496170)



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