ashb commented on a change in pull request #5913: Change SQLSensor to treat
NULL as keep poking.
URL: https://github.com/apache/airflow/pull/5913#discussion_r319019107
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File path: UPDATING.md
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@@ -39,6 +39,13 @@ assists users migrating to a new version.
<!-- END doctoc generated TOC please keep comment here to allow auto update -->
## Airflow Master
+
+### Changes to SQLSensor
+
+SQLSensor now keeps poking after receiving `NULL`. Previously `NULL` response
+has been treated as success criteria. Previous behaviour is still achievable
+setting param `success` to `lambda x: str(x) == 'None'`.
Review comment:
```suggestion
setting param `success` to `lambda x: x is None or str(x) not in ('0', '')`.
```
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