Ruidong Li created FLINK-6334:
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Summary: Refactoring UDTF interface
Key: FLINK-6334
URL: https://issues.apache.org/jira/browse/FLINK-6334
Project: Flink
Issue Type: Improvement
Components: Table API & SQL
Reporter: Ruidong Li
UDTF's apply method returns a Table Type, so Join(UDTF('a, 'b, ...) as 'c)
shall be viewed as join(Table)
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