graceguo-supercat opened a new issue #17324:
URL: https://github.com/apache/superset/issues/17324


   A clear and concise description of what the bug is.
   
   #### How to reproduce the bug
   
   1. Make a dataset with high-cardinality.
   2. create a Time Series chart, and add group by the high-cardinality column. 
for example, this chart shows number of visit group by dashboard_id: 
   <img width="1429" alt="Screen Shot 2021-11-02 at 9 57 33 AM" 
src="https://user-images.githubusercontent.com/27990562/139912617-c4c16e9d-516a-4ba7-b18e-9bb2d53ec0fc.png";>
   
   3. Hover on the chart, the tooltip can not display all dashboard_ids, about 
half of them are out of visible area.
   4. This issue makes this data visualization misleading. People may read 
hover tooltip to find largest value for a given groupby, but we only display 
half of all the values.
   
   
   ### Expected results
   
   display all the values for the given group-by column.
   
   
   
   ### Environment
   
   latest master
   
   ### Checklist
   
   Make sure to follow these steps before submitting your issue - thank you!
   
   - [x] I have checked the superset logs for python stacktraces and included 
it here as text if there are any.
   - [x] I have reproduced the issue with at least the latest released version 
of superset.
   - [x] I have checked the issue tracker for the same issue and I haven't 
found one similar.
   
   ### Additional context
   
   cc @junlincc @villebro 


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