[jira] [Created] (FLINK-12562) Improve code in ExpandColumnFunctionsRule

[Hequn Cheng (JIRA)]

Hequn Cheng created FLINK-12562:
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             Summary: Improve code in ExpandColumnFunctionsRule
                 Key: FLINK-12562
                 URL: https://issues.apache.org/jira/browse/FLINK-12562
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / API
            Reporter: Hequn Cheng
            Assignee: Hequn Cheng


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