xiaomaolu opened a new issue #3270: Superset worker problem
URL: https://github.com/apache/incubator-superset/issues/3270
   Make sure these boxes are checked before submitting your issue - thank you!
   - [ ] I have checked the superset logs for python stacktraces and included 
it here as text if any
   - [ ] I have reproduced the issue with at least the latest released version 
of superset
   - [ ] I have checked the issue tracker for the same issue and I haven't 
found one similar
   ### Superset version
   ### Expected results
   ### Actual results
   ### Steps to reproduce
   Hi , I install the superset , but i meet a problem about SQL Lab 
   I config the config.py about the worker
   class CeleryConfig(object):
     BROKER_URL = 'redis://localhost:6379/0'
     CELERY_IMPORTS = ('superset.sql_lab', )
     CELERY_RESULT_BACKEND = 'redis://localhost:6379/0'
     CELERY_ANNOTATIONS = {'tasks.add': {'rate_limit': '10/s'}}
   CELERY_CONFIG = CeleryConfig
       'super': 'header!'
   from werkzeug.contrib.cache import RedisCache
   RESULTS_BACKEND = RedisCache(
       host='localhost', port=6379, key_prefix='superset_results') 
   But My Questions is When i select something a meet a problem : 
   [2017-08-10 10:48:41,639: INFO/Worker-11] Parsing with sqlparse statement 
select * from  hive.app.al_table_saler_clue_count;
   [2017-08-10 10:48:41,660: INFO/Worker-11] Set query to 'running'
   [2017-08-10 10:48:41,668: ERROR/Worker-11] argument of type 'NoneType' is 
not iterable
   Traceback (most recent call last):
     File "/data/venv/lib/python2.7/site-packages/superset/sql_lab.py", line 
91, in get_sql_results
       ctask, query_id, return_results, store_results)
     File "/data/venv/lib/python2.7/site-packages/superset/sql_lab.py", line 
170, in execute_sql
       schema=query.schema, nullpool=not ctask.request.called_directly)
     File "/data/venv/lib/python2.7/site-packages/superset/models/core.py", 
line 570, in get_sqla_engine
       uri = self.db_engine_spec.adjust_database_uri(uri, schema)
     File "/data/venv/lib/python2.7/site-packages/superset/db_engine_specs.py", 
line 393, in adjust_database_uri
       if '/' in database:
   TypeError: argument of type 'NoneType' is not iterable
   [2017-08-10 10:48:41,669: INFO/Worker-11] [stats_logger] (incr) 
   [2017-08-10 10:48:41,684: INFO/MainProcess] Task 
succeeded in 0.0714395358227s: None
   I do not know how can result it ?
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