Security definer bugs

[yazun]

If an immutable fn is used from other role, problems arise, this is regression versus ver2.2 and XL:

SELECT sourceid 
FROM timeseriesresult
WHERE runid=62 and catalogid=getmaincatalog() and ftimeseriestype = gettsresulttypeid(62,'RemoveOutlierPerTransitOperator_G_CCD') 
limit 10

ERROR:  permission denied to set session authorization

if any of the fn involved has SECURITY DEFNER on.