SevenDL opened a new issue #5535: The annotation layer is unavailable <master> URL: https://github.com/apache/incubator-superset/issues/5535 Make sure these boxes are checked before submitting your issue - thank you! - [√] I have checked the superset logs for python stacktraces and included it here as text if 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 ### Superset version master ### Expected results the annotation layer is rendered as a range successfully ### Actual results there's some bug so the layer cann't be fetched. ### Steps to reproduce 1.Add an annotations layer named"testlayer"; 2.Add an annotation,Start Dttm 1970-01-01 16:27:11,End Dttm 1975-01-01 16:27:11,select "testlayer" as the annotations layer;  3.Add the annotation layer in a time_line graph, but it has some bug.  error1: There is an alert that "ERROR: Only '=', '!=', 'is_()', 'isnot()', 'is_distinct_from()', 'isnot_distinct_from()' operators can be used with None/True/False" error2： Table view as an Event or Interval annotation type can not be select.
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