[jira] [Created] (FLINK-13284) Correct some builtin functions' return type inference

[lincoln lee (JIRA)]

lincoln lee created FLINK-13284:
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             Summary: Correct some builtin functions' return type inference 
                 Key: FLINK-13284
                 URL: https://issues.apache.org/jira/browse/FLINK-13284
             Project: Flink
          Issue Type: Bug
            Reporter: lincoln lee






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