hanyuzheng7 commented on code in PR #22917:
URL: https://github.com/apache/flink/pull/22917#discussion_r1247833079


##########
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  I saw this class all like this    
   ```
   /** See {@link ToTimestampLtzTypeStrategy}. */
       public static final TypeStrategy TO_TIMESTAMP_LTZ = new 
ToTimestampLtzTypeStrategy();
   ```
   
   no one achieve class logic in this class, so why we don' t generate a class 
and new that class like others do?



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