handle RNTupleCardinality field and add test file #209
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fix #208
We treat
RNTupleCardinality
as a special field type.Except this field type is not uniquely identified with
struct_role
, it needs a combination of role and the underlying column type (is it Index32 or Index64).Unfortunately, Column metadata is separate, so we have a bit of "dispatch by value" the situation at hand. See discussion also: root-project/root#12127 (comment)