xuyangzhong commented on code in PR #23684:
URL: https://github.com/apache/flink/pull/23684#discussion_r1403213418


##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/runtime/stream/sql/FunctionITCase.java:
##########
@@ -1698,6 +1717,32 @@ public void eval(@DataTypeHint("STRING") StringData s) {
         }
     }
 
+    /** This is an empty synchronous table function. */
+    private static class LookupTableLevel0Function<T> extends TableFunction<T> 
{}
+
+    /**
+     * Synchronous table function that uses {@link RowData} type inference for 
{@link

Review Comment:
   It seems not to use the RowData type inference, right?



##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/runtime/stream/sql/FunctionITCase.java:
##########
@@ -1698,6 +1717,32 @@ public void eval(@DataTypeHint("STRING") StringData s) {
         }
     }
 
+    /** This is an empty synchronous table function. */
+    private static class LookupTableLevel0Function<T> extends TableFunction<T> 
{}
+
+    /**
+     * Synchronous table function that uses {@link RowData} type inference for 
{@link
+     * LookupTableSource} and inherits {@link TableFunction} at multiple 
levels.
+     */
+    public static class LookupTableWithoutHintLevel1Function

Review Comment:
   Just curious, should we add a test like LookupTableWithHintLevel1Function 
for considerations about the test orthogonality?



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