[GitHub] [incubator-seatunnel] ruanwenjun commented on pull request #1509: [Bug][Spark] When have empty data source, transform not execute

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ruanwenjun commented on pull request #1509:
URL: https://github.com/apache/incubator-seatunnel/pull/1509#issuecomment-1072913823


   > @ruanwenjun
   > 
   > > For example, in the below picture, if we have 3 sources, 2 two transforms, 2 sinks. In the current code, there only source1 will be transformed and sinked.
   > 
   > At now, 3 sources, 2 two transforms, 2 sinks both will execute. The problem is if first source no data, then all transforms will not execute. (If first source' data isn't empty, all plugin will execute)
   > 
   > > I know what you want to fix in this PR, but I want to discuss this problem, otherwise we may still need to repair this again.
   > 
   > We can use multiple source, transform, sink. Because one source/transform will registe as table. So user can join multiple source or transform. Also can do complex data process.
   
   Okay, I just misunderstand something. The source and transform data will be registered as a table.


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