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


   Addition thoughts about whether we should keep select or not. 
   1. SELECT has limitation in realizing complex hierarchy/grouping 
interaction. dimension/columns, metrics grouping and hierarchy are very common 
BI tool, I will send more example in Tableau and PowerBI. 
   
   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? 
   
   
   
   
   Performance considerations: Now all targets have to repeat columns/metrics, 
which is completely unnecessary


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