xuyangzhong commented on a change in pull request #17771:
URL: https://github.com/apache/flink/pull/17771#discussion_r748951364



##########
File path: 
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/functions/BuiltInFunctionTestBase.java
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@@ -193,7 +193,6 @@ private static void testError(
         } catch (AssertionError e) {
             throw e;
         } catch (Throwable t) {
-            assertTrue(t instanceof ValidationException);

Review comment:
       Because a TableException may also be thrown here when we check the 
invalid implicit type conversion between numeric and (var)char.  I think 
writing another catch like `catch (TableException e ) ... ` is unnecessary and 
I can reuse  the code here.




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