I have a 12c Oracle database that has a line feature class and a point feature class that contains geometries , i want to know how i convert to OGC wkt and extract to a .csv file, i have tried to use the Geometry extractor and write to CSV , but when i view the file within the data inspector , no geomtry is present and no values to depcit the geomtry are present either, is there something that I am missing in my workbench ?
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If you read the Oracle table in and display the output in an inspector do you see the geometries?
Yes i opened the inspector and can see the geometries within the window 
Yes i opened the inspector and can see the geometries within the window
So you've used the geometry extractor to get the geometry as well known text in an attribute called _geometry (or whatever you've chosen), written this field into the csv and the field is blank?
please see above , I can see the geometry in the data inspector