grumpy-miner opened a new issue #16371:
URL: https://github.com/apache/superset/issues/16371
When using Custom SQL filter in graphs where dataset is Virtual (SQL)
dataset containing Jinja template as SQL, superset raises an error.
### Expected results
Graph is rendered properly
### Actual results
Superset raises `'NoneType' object has no attribute 'upper'`
```
Traceback (most recent call last):
File "/app/superset/viz.py", line 541, in get_df_payload
df = self.get_df(query_obj)
File "/app/superset/viz.py", line 277, in get_df
self.results = self.datasource.query(query_obj)
File "/app/superset/connectors/sqla/models.py", line 1438, in query
query_str_ext = self.get_query_str_extended(query_obj)
File "/app/superset/connectors/sqla/models.py", line 764, in
get_query_str_extended
sqlaq = self.get_sqla_query(**query_obj)
File "/app/superset/connectors/sqla/models.py", line 1143, in
get_sqla_query
tbl = self.get_from_clause(template_processor)
File "/app/superset/connectors/sqla/models.py", line 793, in
get_from_clause
from_sql = self.get_rendered_sql(template_processor)
File "/app/superset/connectors/sqla/models.py", line 814, in
get_rendered_sql
sql = template_processor.process_template(sql)
File "/app/superset/jinja_context.py", line 426, in process_template
return template.render(context)
File "/usr/local/lib/python3.7/site-packages/jinja2/environment.py", line
1090, in render
self.environment.handle_exception()
File "/usr/local/lib/python3.7/site-packages/jinja2/environment.py", line
832, in handle_exception
reraise(*rewrite_traceback_stack(source=source))
File "/usr/local/lib/python3.7/site-packages/jinja2/_compat.py", line 28,
in reraise
raise value.with_traceback(tb)
File "<template>", line 2, in top-level template code
File "/usr/local/lib/python3.7/site-packages/jinja2/sandbox.py", line 462,
in call
return __context.call(__obj, *args, **kwargs)
File "/app/superset/jinja_context.py", line 323, in safe_proxy
return_value = func(*args, **kwargs)
File "/app/superset/jinja_context.py", line 211, in filter_values
filters = self.get_filters(column, remove_filter)
File "/app/superset/jinja_context.py", line 300, in get_filters
op: str = flt["operator"].upper() if "operator" in flt else None
AttributeError: 'NoneType' object has no attribute 'upper'
```
#### Screenshots
#### How to reproduce the bug
1. Create table in database (in my case Postgres 13)
```
CREATE TABLE test_table (
id INTEGER,
some_text TEXT,
some_date TIMESTAMPTZ,
some_integer INTEGER
);
```
2. Create Virtual dataset
schema: public
dataset_name: test_table
SQL:
```
select * from test_table
{% if filter_values('tag')|length %}
where 1=1
{% endif %}
```
3. Create new chart with visualisation type `Time-series Bar Chart`
4. Set `Group By`: `some_text`
5. Set `Metrics`: `count(*)`
6. Set `Filters` as Custom SQL with statement `where 1=1`
7. Click `Run`
### Environment
- superset version: Superset 0.0.0dev
- Superset [image: apache/superset:latest-dev, pulled 2021-08-19]
- python version: Python 3.7.9
- feature flags active:
- ENABLE_TEMPLATE_PROCESSING
### Checklist
Make sure to follow these steps 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
In url parameters of the chart there is parameter `operator` set to `null`
In file superset/jinja_context.py line 300
```
op: str = flt["operator"].upper() if "operator" in flt else None
```
logic doesn't assume that `flt` dictionary can have `operator` with value
`None` and that's what causes the problem
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