twalthr commented on code in PR #20635:
URL: https://github.com/apache/flink/pull/20635#discussion_r952233096


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flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/runtime/batch/sql/FunctionITCase.java:
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@@ -159,6 +159,22 @@ public void testUsingAddJar() throws Exception {
                 "drop function lowerUdf");
     }
 
+    @Test
+    public void testExpressionReducerByUsingJar() {

Review Comment:
   We should avoid code deduplication in the code base. Most paths around 
functions are identical for both batch and streaming. So I don't think we need 
dedicated tests for `batch/sql/FunctionITCase`. What do you think about 
removing `batch/sql/FunctionITCase` entirely (my recommendation) or at have 
just one basic feature test in there?



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