wuchong commented on pull request #19193:
URL: https://github.com/apache/flink/pull/19193#issuecomment-1076429247


   Thanks @RocMarshal and @lsyldliu for pushing the effort of this feature, and 
sorry for not joining the discussion early. 
   
   I agree with @RocMarshal that we should try to discuss on the original issue 
or PR, so that the later reviewer or contributor can have a full discussion 
context. It is recommended to 
   
   Regarding implementation details, I agree with @lsyldliu a 2K lines PR is 
hard to review. Separating into small PRs is appreciated.  And decoupling ADD 
COLUMN and COLUMN definition logic is also a nice improvement. 
   
   **How to continue this contribution? **
   Considering @lsyldliu has contributed the parser PR, what about let's 
continue the parser work in this PR. And @RocMarshal can rebase 
https://github.com/apache/flink/pull/17560 on this PR to focus on the planner 
part. 
   
   What do you think?
   


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