snuyanzin commented on code in PR #27594:
URL: https://github.com/apache/flink/pull/27594#discussion_r2872844380


##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/operations/SqlMaterializedTableNodeToOperationConverterTest.java:
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@@ -1218,7 +1258,7 @@ private static Collection<TestSpec> 
alterQuerySuccessCase() {
                                 + "  `m` STRING METADATA VIRTUAL,\n"
                                 + "  `calc` AS ['a' || 'b'],\n"
                                 + "  `EXPR$0` INT NOT NULL,\n"
-                                + "  `sec` CHAR(1)\n"
+                                + "  `sec` CHAR(1) NOT NULL\n"

Review Comment:
   there was an issue with nullability while `ALTER`, `CREATE OR ALTER`



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