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When writing out data to a .hyper file (using the Output Tool or the Publish To Tableau Server Tool), the Alteryx Designer throws the following error :
Designer x64 The Designer x64 reported: InboundNamedPipe::ReadFile: Not enough bytes read. The pipe has been ended
This error is triggered when trying to load a standard string (V_string or String) that contains extended ASCII characters 128-255 into a Tableau Hyper file. Tableau only supports valid UTF8 strings.
This can be verified by converting the strings to UTF8 with the ConverToCodePage function using a Formula tool: