I have this problem when run the flow from TERADATA source. I could see the example of flow result but cannot make the output
This was occurring in 2018.1 for some users. Please upgrade to the latest version of Tableau Prep. The latest version should work as expected.
As a workaround, please preview the file in Tableau Desktop on the last step before the Output flow. Once in Desktop either extract the data or export data to .csv file.
Hope this helps!
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