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https://issues.apache.org/jira/browse/AIRFLOW-1237?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bolke de Bruin resolved AIRFLOW-1237.
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Resolution: Fixed
Issue resolved by pull request #2320
[https://github.com/apache/incubator-airflow/pull/2320]
> Fix IN-predicate sqlalchemy warning
> -----------------------------------
>
> Key: AIRFLOW-1237
> URL: https://issues.apache.org/jira/browse/AIRFLOW-1237
> Project: Apache Airflow
> Issue Type: Bug
> Components: db
> Affects Versions: 1.8.0
> Reporter: Stanislav Kudriashev
> Assignee: Stanislav Kudriashev
> Fix For: 1.9.0
>
>
> {code}
> /home/travis/build/apache/incubator-airflow/.tox/py27-cdh-airflow_backend_mysql/lib/python2.7/site-packages/sqlalchemy/sql/default_comparator.py:161:
> SAWarning: The IN-predicate on "dag_stats.dag_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.
> {code}
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