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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/05/08 02:50:17 UTC

[GitHub] [shardingsphere] strongduanmu commented on issue #10271: PostgreSQL `SHOW xxx` syntax conflicting with DistSQL

strongduanmu commented on issue #10271:
URL: https://github.com/apache/shardingsphere/issues/10271#issuecomment-834997974


   @tristaZero I tested PG `show statement` parsing, and found that antlr can match invalid content by default, which caused the `show statement` in distsql to fail to be executed. By specifying a explicit `EOF` lexical symbol, we can force to match all inputs, and invalid content will cause exceptions. 
   
   Before adding `EOF`:
   ![image](https://user-images.githubusercontent.com/10829171/117523407-fefaf600-afea-11eb-8307-06cd83223cf0.png)
   
   After adding `EOF`:
   ![image](https://user-images.githubusercontent.com/10829171/117523479-1c2fc480-afeb-11eb-8a7d-f9d69243ffc7.png)
   


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