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Unhashable type error when adding a table #8915

kinghuang opened this issue Jan 2, 2020 · 2 comments

Unhashable type error when adding a table #8915

kinghuang opened this issue Jan 2, 2020 · 2 comments


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@kinghuang kinghuang commented Jan 2, 2020

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.


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/", line 351, in pre_add
  File "/usr/local/lib/python3.6/site-packages/superset/connectors/sqla/", 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/", line 1161, in get_table
  File "<string>", line 2, in __new__
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/", line 128, in warned
    return fn(*args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/", line 506, in __new__
    metadata._remove_table(name, schema)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/", line 68, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/util/", line 153, in reraise
    raise value
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/", line 501, in __new__
    table._init(name, metadata, *args, **kw)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/", line 595, in _init
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/sql/", line 619, in _autoload
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/", line 2163, in run_callable
    return conn.run_callable(callable_, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/", line 1615, in run_callable
    return callable_(self, *args, **kwargs)
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/", line 460, in reflecttable
    table, include_columns, exclude_columns, resolve_fks, **opts
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/", line 642, in reflecttable
    table_name, schema, **table.dialect_kwargs
  File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/", 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/", 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.


(please complete the following information):

  • superset version: Superset 0.35.1
  • python version: Python 3.6.10
  • node.js version: none
  • npm version: none


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 there are 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.

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@issue-label-bot issue-label-bot bot commented Jan 2, 2020

Issue-Label Bot is automatically applying the label #bug to this issue, with a confidence of 0.94. Please mark this comment with 👍 or 👎 to give our bot feedback!

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@issue-label-bot issue-label-bot bot added the #bug label Jan 2, 2020

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@kinghuang kinghuang commented Jan 2, 2020

It appears this issue was introduced by a change in sqlalchemy 1.3.11 that impacts sqlalchemy-redshift. I'm able to work around it by temporarily downgrading to sqlalchemy 1.3.10.


@kinghuang kinghuang closed this Jan 2, 2020
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