junlincc edited a comment on pull request #13210:
URL: https://github.com/apache/superset/pull/13210#issuecomment-785228920


   Additional to 
https://github.com/apache/superset/pull/13210#discussion_r582080120 on whether 
we should keep `SELECT`  
   1. SELECT has limitation in realizing complex hierarchy/grouping 
interaction. dimension/columns, metrics grouping and hierarchy are very common 
BI tool which which we currently lack. 
   
   2. When there are multiple DROP targets, dnd help set some drop 
restrictions. For example, If target A is dropped, target B will not accept 
drop values. (There are cases in PivotTable where  groupby and column restrict 
each other)
   
   3. performance. do we need to render options in dimensions/columns and 
metrics twice with both? 
   
   @villebro @kgabryje @ktmud @mistercrunch let's keep the discussion going so 
Design can have enough information to go on. 
   


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