[I] Remove unnecessary projection in `single_distinct_to_group_by` rule [arrow-datafusion]

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

haohuaijin opened a new issue, #8086:
URL: https://github.com/apache/arrow-datafusion/issues/8086

   ### Is your feature request related to a problem or challenge?
   
   In `single_distinct_to_group_by` rule, we used [`Projection`](https://github.com/apache/arrow-datafusion/blob/0506a5cff2c61f289e805d9ecd222ce2f79e4097/datafusion/optimizer/src/single_distinct_to_groupby.rs#L236-L239) to make the schema consistent before and after optimization. The `Projection` just do the `Alias` task and , so we can directly use `Alias`  in aggregate function to eliminate `Projection` and make code more clear.
   
   ### Describe the solution you'd like
   
   use `alias` instead of `projection` in `single_distinct_to_group_by` rule. 
   
   the only problem is use `alias` may case a display error in explain plan, see https://github.com/apache/arrow-datafusion/pull/8061#discussion_r1383222931.
   but the output column name is equal, see https://github.com/apache/arrow-datafusion/pull/8061#discussion_r1385972626
   
   ### Describe alternatives you've considered
   
   _No response_
   
   ### Additional context
   
   _No response_


-- 
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@arrow.apache.org.apache.org

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

Re: [I] Remove unnecessary projection in `single_distinct_to_group_by` rule [arrow-datafusion]

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

alamb closed issue #8086: Remove unnecessary projection in `single_distinct_to_group_by` rule
URL: https://github.com/apache/arrow-datafusion/issues/8086


-- 
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@arrow.apache.org

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