[jira] [Created] (FLINK-12298) Make column functions accept custom

[Dawid Wysakowicz (JIRA)]

Dawid Wysakowicz created FLINK-12298:
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             Summary: Make column functions accept custom 
                 Key: FLINK-12298
                 URL: https://issues.apache.org/jira/browse/FLINK-12298
             Project: Flink
          Issue Type: Improvement
            Reporter: Dawid Wysakowicz






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