zihaoAK47 commented on PR #29015:
URL: https://github.com/apache/shardingsphere/pull/29015#issuecomment-1810005603

   > Hi @zihaoAK47, can you show antlr preview for more than one union 
statement? It seems that the priority processing of multiple Union statements 
is wrong.
   
   Hi mentor, I have submitted a new parsing code.
   The following is a preview image of Antlr parsing
   
   
![1](https://github.com/apache/shardingsphere/assets/106047330/a05e7153-f8bc-4803-af8a-eaeccfe65b1b)
   
![2](https://github.com/apache/shardingsphere/assets/106047330/324b9985-f45b-4f7b-b38d-596154932def)
   


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