[GitHub] lrcutra opened a new issue #4805: "Custom" dimensions in Druid datasources cause problems with some Visualization types

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lrcutra opened a new issue #4805: "Custom" dimensions in Druid datasources cause problems with some Visualization types
URL: https://github.com/apache/incubator-superset/issues/4805
 
 
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   - [x] I have checked the superset logs for python stacktraces and included it here as text if 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
   
   
   ### Superset version
   0.24.0
   
   All problems mentioned within this issue relate to Druid datasources.
   
   ### Expected results
   Superset should visualize the query when using user-defined dimension in Group-By clause.
   
   ### Actual results
   With some types of visualizations it's not possible to use custom dimensions (e.g. lookup, extractions [extractionFn of any kind]) in the Group-by clause.
   
   Using a single custom dimension in Group-by with Visualization Type: "Distribution - Bar Chart", the result looks as follows:
   
   Only the name of the dimension is displayed, but no visualization at all.
   
   Adding at least one additional dimension (of any kind) solves the problem, and the visualization works.
   
   However it remains impossible to use some types of visualizations when grouping by a single "custom" dimension.
   
   ### Steps to reproduce
   Add an individual dimension to your Druid datasource by specifying a custom json [e.g. lookup or extraction]. Use this dimension within the Group-By clause of your query with visualization type "Distribution-Bar chart".
   Superset won't visualize but only return the name of the "custom" dimension.
   
   
   

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