liukun4515 commented on issue #210:
URL: 
https://github.com/apache/arrow-datafusion/issues/210#issuecomment-1022804688


   @alamb 
   this issue can be closed
   ```
   ❯ \d food
   
+---------------+--------------+------------+-------------+-----------------+-------------+
   | table_catalog | table_schema | table_name | column_name | data_type       
| is_nullable |
   
+---------------+--------------+------------+-------------+-----------------+-------------+
   | datafusion    | public       | food       | a           | Decimal(10, 5)  
| NO          |
   | datafusion    | public       | food       | b           | Decimal(20, 15) 
| NO          |
   | datafusion    | public       | food       | c           | Boolean         
| NO          |
   
+---------------+--------------+------------+-------------+-----------------+-------------+
   3 rows in set. Query took 0.010 seconds.
   ❯ select count(*),a from food group by a;
   +-----------------+---------+
   | COUNT(UInt8(1)) | a       |
   +-----------------+---------+
   | 3               | 0.00003 |
   | 1               | 0.00001 |
   | 4               | 0.00004 |
   | 5               | 0.00005 |
   | 2               | 0.00002 |
   +-----------------+---------+
   ```


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