strongduanmu commented on issue #21616:
URL: 
https://github.com/apache/shardingsphere/issues/21616#issuecomment-1407901218

   I think this work is meaningful. A mature distributed database should be 
able to describe the range of syntax it supports. For example, cockroachdb and 
tidb are compatible with postgresql and mysql, but they also provide sql syntax 
railway diagrams.
   
   PostgreSQL sql grammar - 
https://www.cockroachlabs.com/docs/stable/sql-grammar.html.
   TiDB sql grammar - 
https://docs.pingcap.com/zh/tidb/stable/sql-statement-add-column.


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