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Csv preview

Nicolas Vuaille requested to merge nicolas.vuaille/vtk:CSVPreview into master

Read the PreviewNumberOfLines first lines of the input file during the RequestInformation, and store them as a string (i.e. without parsing) accessible with GetPreview.

This allows to configure the reader options (like HaveHeaders) before the call to RequestData, which can be costly.

Edited by Nicolas Vuaille

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