I understand that you would like to restore data from Cloud SQL to a Cloud Storage bucket but you are receiving Error 1227. I was able to find an explanation indicating that this operation needs a Super User permission that a managed Cloud SQL does not offer at this moment.
I was able to find this document, which describes how to generate a CSV from Cloud SQL as an alternative.
Would this be a sufficient workaround for you? I know this must be frustrating not to have technology not behaving as you wish. Please let us know your thoughts.
I would believe that the community may offer further advice or other ways to accomplish what you would like to do in another way in addition to the one I suggested.
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