davidradl commented on code in PR #27929:
URL: https://github.com/apache/flink/pull/27929#discussion_r3093942309


##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/types/inference/SystemTypeInference.java:
##########
@@ -374,14 +375,20 @@ private List<Field> deriveRowtimeField(CallContext 
callContext) {
                                 if (!staticArg.is(StaticArgumentTrait.TABLE)) {
                                     return;
                                 }
+                                final String argName = staticArg.getName();
                                 final RowType rowType =
                                         
LogicalTypeUtils.toRowType(args.get(pos).getLogicalType());
                                 final int onTimeColumn =
-                                        findUniqueOnTimeColumn(
-                                                staticArg.getName(), rowType, 
onTimeFields);
+                                        findUniqueOnTimeColumn(argName, 
rowType, onTimeFields);
                                 if (onTimeColumn >= 0) {
                                     
usedOnTimeFields.add(rowType.getFieldNames().get(onTimeColumn));
                                     
onTimeColumns.add(rowType.getTypeAt(onTimeColumn));
+                                    // If ORDER BY is defined, it must match 
the on_time column

Review Comment:
   I am wondering do we need to validate that the same column is not referenced 
twice in the the order by columns.



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