kinghuang opened a new issue #8915: Unhashable type error when adding a table
URL: https://github.com/apache/incubator-superset/issues/8915
 
 
   I've added a Redshift database, and I'm trying to add a table. After I 
select the database and fill in the schema and table name, I get a `TypeError: 
unhashable type: 'list'` from Superset.
   
   ### Expected results
   
   The table should be added.
   
   ### Actual results
   
   A TypeError is raised.
   
   #### Screenshots
   
   ```
   2020-01-02 19:31:30,418:INFO:root:Database.get_sqla_engine(). Masked URL: 
redshift+psycopg2://XXXXXXXXXX:XXXXXXXXXX@XXXXXXXXXX:5439/XXXXXXXXXX
   Got an error in pre_add for sa.invoice_detail
   Traceback (most recent call last):
     File 
"/usr/local/lib/python3.6/site-packages/superset/connectors/sqla/views.py", 
line 351, in pre_add
       table.get_sqla_table_object()
     File 
"/usr/local/lib/python3.6/site-packages/superset/connectors/sqla/models.py", 
line 964, in get_sqla_table_object
       return self.database.get_table(self.table_name, schema=self.schema)
     File "/usr/local/lib/python3.6/site-packages/superset/models/core.py", 
line 1161, in get_table
       autoload_with=self.get_sqla_engine(),
     File "<string>", line 2, in __new__
     File 
"/usr/local/lib/python3.6/site-packages/sqlalchemy/util/deprecations.py", line 
128, in warned
       return fn(*args, **kwargs)
     File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/schema.py", 
line 506, in __new__
       metadata._remove_table(name, schema)
     File 
"/usr/local/lib/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 
68, in __exit__
       compat.reraise(exc_type, exc_value, exc_tb)
     File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/compat.py", 
line 153, in reraise
       raise value
     File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/schema.py", 
line 501, in __new__
       table._init(name, metadata, *args, **kw)
     File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/schema.py", 
line 595, in _init
       resolve_fks=resolve_fks,
     File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/schema.py", 
line 619, in _autoload
       _extend_on=_extend_on,
     File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py", 
line 2163, in run_callable
       return conn.run_callable(callable_, *args, **kwargs)
     File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/base.py", 
line 1615, in run_callable
       return callable_(self, *args, **kwargs)
     File 
"/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/default.py", line 
460, in reflecttable
       table, include_columns, exclude_columns, resolve_fks, **opts
     File 
"/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/reflection.py", line 
642, in reflecttable
       table_name, schema, **table.dialect_kwargs
     File 
"/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/reflection.py", line 
369, in get_columns
       self.bind, table_name, schema, info_cache=self.info_cache, **kw
     File "<string>", line 2, in get_columns
     File 
"/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/reflection.py", line 
50, in cache
       ret = info_cache.get(key)
   TypeError: unhashable type: 'list'
   ```
   
   #### How to reproduce the bug
   
   1. Go to Sources → Tables.
   2. Click on + (Add a new record).
   3. Fill in the database, schema, and table name. Press Save.
   4. See error.
   
   ### Environment
   
   (please complete the following information):
   
   - superset version: Superset 0.35.1
   - python version: Python 3.6.10
   - node.js version: none
   - npm version: none
   
   ### Checklist
   
   Make sure these boxes are checked before submitting your issue - thank you!
   
   - [X] I have checked the superset logs for python stacktraces and included 
it here as text if there are any.
   - [X] I have reproduced the issue with at least the latest released version 
of superset.
   - [X] I have checked the issue tracker for the same issue and I haven't 
found one similar.
   
   ### Additional context
   
   None.
   

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