xuyangzhong commented on code in PR #24760:
URL: https://github.com/apache/flink/pull/24760#discussion_r1594018523


##########
flink-table/flink-sql-parser/src/main/java/org/apache/flink/sql/parser/ddl/SqlAlterMaterializedTableRefresh.java:
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@@ -58,4 +58,9 @@ public void unparse(SqlWriter writer, int leftPrec, int 
rightPrec) {
                     writer, getOperator().getLeftPrec(), 
getOperator().getRightPrec());
         }
     }
+
+    @Nullable

Review Comment:
   I just notice that in construct, `partitionSpec` is tagged `@Nullable`. I'll 
update it.



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