[GitHub] SpyderRivera commented on issue #4740: Add extraction function support for Druid queries

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SpyderRivera commented on issue #4740: Add extraction function support for 
Druid queries
URL: 
https://github.com/apache/incubator-superset/pull/4740#issuecomment-386110982
 
 
   The filtering works when an extractionFn is added to the dimension spec of 
the lookup, but then the look up doesn't work as a column.
   
   ```{
     "dimension": "country",
     "outputName": "country_group",
     "outputType": "STRING",
     "retainMissingValue": true,
     "type": "selector",
     "extractionFn": {
       "type": "lookup",
       "lookup": {
         "map": {
           "Algeria": "EMEA",
           "Faroe Islands": "EMEA",
           "Luxembourg": "EMEA",
           "Andorra": "EMEA",
           "Cameroon": "EMEA",
           "Burkina Faso": "EMEA",
           "Benin": "EMEA",
           "Bahrain": "EMEA",
           "Aland Islands": "EMEA",
           "Australia": "AU/NZ",
           "Iceland": "EMEA",
           "Cape Verde": "EMEA",
           "Germany": "EMEA",
           "Bosnia and Herzegovina": "EMEA",
           "Belgium": "EMEA",
           "Netherlands": "EMEA",
           "Central African Republic": "EMEA",
           "Belarus": "EMEA",
           "Albania": "EMEA",
           "Switzerland": "EMEA",
           "New Zealand": "AU/NZ",
           "Bulgaria": "EMEA",
           "Greenland": "EMEA",
           "Angola": "EMEA",
           "Chad": "EMEA",
           "Svalbard and Jan Mayen": "EMEA",
           "Comoros": "EMEA",
           "Austria": "EMEA",
           "Burundi": "EMEA",
           "Botswana": "EMEA"
         },
         "type": "map",
         "isOneToOne": false
       }
     }
   }
   ``` 
   VS
   
   ```
   {
       "type": "lookup",
       "dimension": "country",
       "outputName": "country_group",
       "outputType": "STRING",
       "retainMissingValue": true,
       "lookup": {
         "type": "map",
         "map": {
           "Australia": "AU/NZ",
           "New Zealand": "AU/NZ",
           "Aland Islands": "EMEA",
           "Belgium": "EMEA",
           "Faroe Islands": "EMEA",
           "Greenland": "EMEA",
           "Iceland": "EMEA",
           "Luxembourg": "EMEA",
           "Netherlands": "EMEA",
           "Svalbard and Jan Mayen": "EMEA",
           "Austria": "EMEA",
           "Germany": "EMEA",
           "Switzerland": "EMEA",
           "Albania": "EMEA",
           "ALgeria": "EMEA",
           "Andorra": "EMEA",
           "Angola": "EMEA",
           "Bahrain": "EMEA",
           "Belarus": "EMEA",
           "Benin": "EMEA",
           "Bosnia and Herzegovina": "EMEA",
           "Botswana": "EMEA",
           "Bulgaria": "EMEA",
           "Burkina Faso": "EMEA",
           "Burundi": "EMEA",
           "Cameroon": "EMEA",
           "Cape Verde": "EMEA",
           "Central African Republic": "EMEA",
           "Chad": "EMEA",
           "Comoros": "EMEA"
         },
         "isOneToOne": false
       }
     }
   ```
   Here you can see the filter works, but the column values for country group 
are not populating.
   ![screen shot 2018-05-02 at 2 27 16 
pm](https://user-images.githubusercontent.com/3988262/39547568-34fdc8c6-4e15-11e8-9beb-faf495946163.png)
   

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