Hi,
We have Flask app which uses SQLAlchemy. Weird error started to happen
recently. The difficulty is that we can't reproduce the error (/figure
out conditions causing issue) - maybe someone could help. Any hints/tips
would be appreciated.
There is a part in the code which constructs IN in SQL:
MyModel.id.in_(my_ids)
For some cases my_ids is an empty list. It works without any problems,
but after some time the same query (using empty list) starts to raise an
exception:
SAWarning: The IN-predicate on "MyModel.id" was invoked with an empty
sequence. This results in a contradiction, which nonetheless can be
expensive to evaluate. Consider alternative strategies for improved
performance.
After restarting app, everything works again.
The question is - why this exception is not risen always (although we
tried to run app with empty list directly), but after some time of app
execution (~1 day)?
Details:
Flask==0.10.1
Flask-SQLAlchemy==2.1
SQLAlchemy==1.0.14
MySQL DB
Cheers
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