[GitHub] [dolphinscheduler] fengjian1129 opened a new issue, #12057: [Bug] [task-plugin] When the sql query result is empty, the email fails to send the attachment, and an exception will be reported

[GitBox]

fengjian1129 opened a new issue, #12057:
URL: https://github.com/apache/dolphinscheduler/issues/12057

   ### Search before asking
   
   - [X] I had searched in the 
[issues](https://github.com/apache/dolphinscheduler/issues?q=is%3Aissue) and 
found no similar issues.
   
   
   ### What happened
   
   when the sql query result is empty, dolphinscheduler-alert.log screenshot is 
as follows:
   <img width="1365" alt="image" 
src="https://user-images.githubusercontent.com/35831367/191156893-f3d9e8c0-317b-4152-93a0-dcef8618dfeb.png";>
   Email can't be sent
   <img width="1362" alt="image" 
src="https://user-images.githubusercontent.com/35831367/191157074-be76e4ea-091b-4cb1-a2f0-2233b386f028.png";>
   
   
   ### What you expected to happen
   
   I think we should send an empty attachment and write the table structure and 
empty results of the query to the attachment
   such as
   <img width="424" alt="image" 
src="https://user-images.githubusercontent.com/35831367/191159120-ddcbc239-7a41-4a95-b8aa-f9dc26a1b6d6.png";>
   
   
   ### How to reproduce
   
   ..
   
   ### Anything else
   
   _No response_
   
   ### Version
   
   3.0.0
   
   ### Are you willing to submit PR?
   
   - [X] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of 
Conduct](https://www.apache.org/foundation/policies/conduct)
   


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