LuciferYang edited a comment on pull request #24809:
URL: https://github.com/apache/spark/pull/24809#issuecomment-711731731


   Case 1:
   ```
   SELECT 1 UNION SELECT 1
   ```
   Failed
   
   Case 2:
   ```
   (SELECT 1) UNION SELECT 1
   ```
   Passed
   
   Case 2:
   ```
   SELECT 1 UNION DISTINCT SELECT 1
   ```
   Passed
   
   Case 4:
   ```
   SELECT 1 UNION All SELECT 1
   ```
   Passed


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