Dealing with missing values in RDataFrame(CSV)

etejedor · January 7, 2020, 10:44am

Hi,

Regarding the DOS format problem, please see my answer here:

As for the RCsvDataSource, this is the relevant file in ROOT:

root-project/root/blob/master/tree/dataframe/src/RCsvDS.cxx

// Author: Enric Tejedor CERN  10/2017

/*************************************************************************
 * Copyright (C) 1995-2022, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

// clang-format off
/** \class ROOT::RDF::RCsvDS
    \ingroup dataframe
    \brief RDataFrame data source class for reading CSV files.

The RCsvDS class implements a CSV file reader for RDataFrame.

A RDataFrame that reads from a CSV file can be constructed using the factory method
ROOT::RDF::FromCSV, which accepts five parameters:
1. Path to the CSV file.

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Possibly it should be enough to add the support for the empty values in ParseValue