JingsongLi commented on issue #10619: [FLINK-15175]Fix CTES not supported in 
SQL CLI
URL: https://github.com/apache/flink/pull/10619#issuecomment-566926207
 
 
   > We should be careful with introducing new SQL syntax. Is this official SQL 
standard? Are other vendors (like Oracle, Hive, Postgres) supporting this as 
well? It would be nice if you can do some research here.
   
   +1.
   Calcite support this syntax.
   If not so official, I think we can wait the refactor of SQL-CLI, then using 
calcite to parse query in SQL-CLI, and this syntax will be supported.

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