How watermark is generated in sql DDL statement

Posted by lec ssmi on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/How-watermark-is-generated-in-sql-DDL-statement-tp34391.html

Hi:

   In sql API , the declaration of watermark is realized by ddl statement . But which way is it implemented?

   PeriodicWatermark   or   PunctuatedWatermark？

  There seems to be  no explanation on the official website.

   

  Thanks.