Recognize vector components and make them vectors for file readers other that CGNS
The CGNS reader checks the last character in the variable name, and if it ends in X, Y, or Z, it sets isComponent = true and creates a vector for that variable (VTKExtensions/CGNSReader/vtkCGNSReaderInternal.cxx:635). This is not done in the Tecplot reader, and possibly others.