Re: [I] [BLOG] Blog post about writing your own SQL dialect / extending SQL with DataFusion [datafusion]

["alamb (via GitHub)" <gi...@apache.org>]

alamb commented on issue #16756:
URL: https://github.com/apache/datafusion/issues/16756#issuecomment-3612456922

   @geoffreyclaude made a really nice PR with examples of extending SQL relations to implement PIVOT/UNPIVOT, TABLESAMPLE, etc
   - https://github.com/apache/datafusion/pull/17843
   
   I think two good examples we could use in the blog post are:
   1. support custom operators (adapt the example from https://github.com/apache/datafusion/blob/0f83c1d233499e80fd9b0baf89dd624099c1d1ba/datafusion/core/tests/user_defined/expr_planner.rs#L42-L41)
   2. Supporting custom syntax (like `TABLESAMPLE`, `PIVOT`, etc) from https://github.com/apache/datafusion/pull/17843
   
   
   So we could also enumerate the possible places to customize planning:
   1. expression planning with `ExprPlanner`
   2. type planning with `TypePlanner`
   3. after https://github.com/apache/datafusion/pull/17843, relation planning with `RelationPlanner`
   


-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: github-unsubscribe@datafusion.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org


---------------------------------------------------------------------
To unsubscribe, e-mail: github-unsubscribe@datafusion.apache.org
For additional commands, e-mail: github-help@datafusion.apache.org