Improve semantics of data member #17927
Merged
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Change the data member holding the column names which should be ignored in case of TTreeReader errors regarding missing branches, from std::vector to std::set. The column names should not be repeated to avoid having multiple times the same column name left in the data member, which results in leftover names even after the corresponding operation of the computation graph has finished. Once a column is found, it will be available for all nodes of the computation graph anyway.
Part 4 of N for #17895