cabo40 opened a new issue #13829:
URL: https://github.com/apache/superset/issues/13829


   When a DB has asynchronous query execution enabled the json dumper doesn't 
honor the default parser because `encoding` is not `None`
   
https://github.com/apache/superset/blob/18ff4841862cd53c92614805ae6db188e3379850/superset/views/core.py#L2214
   Steps to reproduce on vanilla installation:
   1. Set sample DB to async execution in Data / Databases
   2. Query in SQL Lab the following: 
   ```sql
   select decode('DEADBEEF', 'hex');
   ```
   Result:
   
![image](https://user-images.githubusercontent.com/1605852/112706151-efbf4f00-8e67-11eb-9451-0bdee3ddc096.png)


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