snuyanzin commented on code in PR #27807:
URL: https://github.com/apache/flink/pull/27807#discussion_r2973800003


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flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/operations/SqlNodeToOperationSqlCreateOrAlterMaterializedTableConverterTest.java:
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Review Comment:
   >It would be interesting to have a test that has a schema with only 
watermark/constraint, no regular columns
   
   what do you mean by that?
   
   if there is no explicit columns in schema they will be derived from query 
and there are already such tests here



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