snuyanzin commented on code in PR #27488:
URL: https://github.com/apache/flink/pull/27488#discussion_r2741302979


##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/operations/SqlMaterializedTableNodeToOperationConverterTest.java:
##########
@@ -1188,7 +1207,7 @@ private static Collection<TestSpec> 
alterQuerySuccessCase() {
                         "ALTER MATERIALIZED TABLE base_mtbl_with_non_persisted 
AS SELECT 1",
                         "(\n"
                                 + "  `m` STRING METADATA VIRTUAL,\n"
-                                + "  `calc` AS 'a' || 'b',\n"
+                                + "  `calc` AS ['a' || 'b'],\n"

Review Comment:
   together with validation resolving moved to operation level
   square brackets mean unresolved expression
   
https://github.com/apache/flink/blob/ae4583209f5f9b89ee98bc069b7f2fe8c882de2a/flink-table/flink-table-common/src/main/java/org/apache/flink/table/expressions/SqlCallExpression.java#L41-L42
   



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