[Paraview] Writing single data array to file

[Matthew Mosby]

I am writing a batch processing script to which writes the output of some
filters to a file. I am really only interested in one of the data arrays in
the result and it would be nice to pass that single data array to a writer,
e.g. CSVWriter. Is this possible? If so, how do I do it? An outline of my
script is below:

servermanager.LoadState(options.inputf)
GetSources()
dr = FindSource("dissipation_rate")

## I Want to get a single data array from object/source dr ###
dr_array = ???

writer = CreateWriter(options.outputf,dr_array)
writer.FieldAssociation = "Cells"
writer.UpdatePipeline()
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