[GitHub] [incubator-druid] pdeva commented on issue #7584: Cant refer to variables declared inside sql statements for post aggregations

[GitBox <gi...@apache.org>]

pdeva commented on issue #7584: Cant refer to variables declared inside sql statements for post aggregations
URL: https://github.com/apache/incubator-druid/issues/7584#issuecomment-489762176
 
 
   @vogievetsky here is an example:
   
   1. MySQL query with `GROUP BY` using variable `s`
   ```sql
   
   select count(*), dataSource AS s
   from druid_rules
   group by s;
   ```
   Works as expected
   
   2. Druid SQL query with `GROUP BY` using variable `gran` :
   ```sql
   SELECT sum ("mem_used") as memUsed, TIME_FLOOR("__time", 'PT2S') as gran
   FROM "metrics" 
   WHERE "__time" >= TIMESTAMP '2019-05-06 19:32:42' AND "__time" < TIMESTAMP '2019-05-06 19:32:48'  
   GROUP BY  gran
   ```
   
   Result:
   ```
   Bad Request: Unknown exception: org.apache.calcite.runtime.CalciteContextException:  Column 'gran' not found in any table
   ```

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