[jira] [Created] (FLINK-19824) Refactor and merge SupportsComputedColumnPushDown and SupportsWatermarkPushDown interfaces

["Jark Wu (Jira)" <ji...@apache.org>]

Jark Wu created FLINK-19824:
-------------------------------

             Summary: Refactor and merge SupportsComputedColumnPushDown and SupportsWatermarkPushDown interfaces
                 Key: FLINK-19824
                 URL: https://issues.apache.org/jira/browse/FLINK-19824
             Project: Flink
          Issue Type: Sub-task
          Components: Table SQL / API
            Reporter: Jark Wu


As discussed in mailing list [1], the existing SupportsComputedColumnPushDown and SupportsWatermarkPushDown are confusing and hard to implement for connectors. The 
{{SupportsComputedColumnPushDown}} only used for watermark push down. Therefore, 
 combining them into a single interface {{SupportsWatermarkPushDown}} would be better and also work. The proposed interface looks like this:


{code:java}
public interface SupportsWatermarkPushDown {
    
    void applyWatermark(org.apache.flink.table.sources.wmstrategies.WatermarkStrategy<RowData> watermarkStrategy);
    
}
{code}



[1]: http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/Merge-SupportsComputedColumnPushDown-and-SupportsWatermarkPushDown-td44387.html



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