[chart]Error loading graph when IS (NOT) NULL filter is present

Table chart created before upgrade to 1.1.0 but after upgrade there’s error.

Expected results

Table chart shown ok

Actual results

Not working Table chart

Screenshots

How to reproduce the bug

1. Open dashboard with already created Table chart
2. See error

Environment

(please complete the following information):

• superset version: 1.1.0
• python version: 3.8.7
• node.js version: v12.21.0

Checklist

Make sure to follow these steps 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.

Additional context

Log:

Apr 15 21:02:42 node6 python3.8[1195778]: 'val'
Apr 15 21:02:42 node6 python3.8[1195778]: Traceback (most recent call last):
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/common/query_context.py", line 361, in get_df_payload
Apr 15 21:02:42 node6 python3.8[1195778]:     query_result = self.get_query_result(query_obj)
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/common/query_context.py", line 114, in get_query_result
Apr 15 21:02:42 node6 python3.8[1195778]:     result = self.datasource.query(query_object.to_dict())
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/connectors/sqla/models.py", line 1313, in query
Apr 15 21:02:42 node6 python3.8[1195778]:     query_str_ext = self.get_query_str_extended(query_obj)
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/connectors/sqla/models.py", line 772, in get_query_str_extended
Apr 15 21:02:42 node6 python3.8[1195778]:     sqlaq = self.get_sqla_query(**query_obj)
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/connectors/sqla/models.py", line 1080, in get_sqla_query
Apr 15 21:02:42 node6 python3.8[1195778]:     eq = utils.cast_to_num(flt["val"])
Apr 15 21:02:42 node6 python3.8[1195778]: KeyError: 'val'
Apr 15 21:02:42 node6 python3.8[1195778]: ERROR:superset.common.query_context:'val'
Apr 15 21:02:42 node6 python3.8[1195778]: Traceback (most recent call last):
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/common/query_context.py", line 361, in get_df_payload
Apr 15 21:02:42 node6 python3.8[1195778]:     query_result = self.get_query_result(query_obj)
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/common/query_context.py", line 114, in get_query_result
Apr 15 21:02:42 node6 python3.8[1195778]:     result = self.datasource.query(query_object.to_dict())
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/connectors/sqla/models.py", line 1313, in query
Apr 15 21:02:42 node6 python3.8[1195778]:     query_str_ext = self.get_query_str_extended(query_obj)
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/connectors/sqla/models.py", line 772, in get_query_str_extended
Apr 15 21:02:42 node6 python3.8[1195778]:     sqlaq = self.get_sqla_query(**query_obj)
Apr 15 21:02:42 node6 python3.8[1195778]:   File "/usr/local/lib/python3.8/site-packages/superset/connectors/sqla/models.py", line 1080, in get_sqla_query
Apr 15 21:02:42 node6 python3.8[1195778]:     eq = utils.cast_to_num(flt["val"])
Apr 15 21:02:42 node6 python3.8[1195778]: KeyError: 'val'

[dusatvoj]

@rumbin Better? 😄

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