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I have the exact same issue.If I am connected live then it works fine but the moment I try to create a data extract it gives me an error. This error shows up only if the data returned is > 10,000 rows.
This is a known issue and I currently have a ticket opened with Tableau support.
However there is a workaround - you can connect to your database using the ODBC and not the PostgreSQL driver in Tableau. I do not get any error while creating extracts irrespective of the number of rows returned.
Hope this helps. Let me know if you have any questions.