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Posted to issues@flink.apache.org by "Jark Wu (JIRA)" <ji...@apache.org> on 2017/08/29 02:28:00 UTC

[jira] [Created] (FLINK-7548) Support watermark generation for TableSource

Jark Wu created FLINK-7548:
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             Summary: Support watermark generation for TableSource
                 Key: FLINK-7548
                 URL: https://issues.apache.org/jira/browse/FLINK-7548
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
            Reporter: Jark Wu


As discussed in FLINK-7446, currently the TableSource only support to define rowtime field, but not support to extract watermarks from the rowtime field. We can provide a new interface called {{DefinedWatermark}}, which has two methods {{getRowtimeAttribute}} (can only be an existing field) and {{getWatermarkGenerator}}. The {{DefinedRowtimeAttribute}} will be marked deprecated.

How to support periodic and punctuated watermarks and support some built-in strategies needs further discussion.



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