wuchong commented on issue #10015: [FLINK-14539][Table SQL/Planner]Unique key metadata should be ketp wh… URL: https://github.com/apache/flink/pull/10015#issuecomment-547735177 After rethinking this issue, I think we may can't support drivation primary key from concat/concat_ws. For example, if we have a primary key (f0, f1, f2) which are all varchar type, say we have two unique records ('a', 'b', 'c') and ('ab', '', 'c'), but the results of concat(f0, f1, f2) are the same, which means the concat value is not primary key anymore.
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