[jira] [Created] (FLINK-37547) Add initial document for PTFs

[Timo Walther (Jira)]

Timo Walther created FLINK-37547:
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             Summary: Add initial document for PTFs
                 Key: FLINK-37547
                 URL: https://issues.apache.org/jira/browse/FLINK-37547
             Project: Flink
          Issue Type: Sub-task
          Components: Documentation
            Reporter: Timo Walther
            Assignee: Timo Walther


Add documentation for phase 1.



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