Avoid including ambiguous TTree branch names #19399
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When the input data source is a TTree, GetColumnNames gathers the list of all
the available TTree branches. In case there are two branches in the tree (e.g.
`el1` and `el2`), each of them has a sub-branch with the same name (e.g.
`electron_pt`), TTree allows calling `GetBranch("electron_pt")` and returns the
pointer to the sub-branch of the first main branch (i.e. `el1.electron_pt`).
This behaviour can lead to ambiguities, thus avoid exposing the ambiguous column
name via RDF.
A test is added to exemplify this case.
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When the input data source is a TTree, GetColumnNames gathers the list of all the available TTree branches. In case there are two branches in the tree (e.g.
el1andel2), each of them has a sub-branch with the same name (e.g.electron_pt), TTree allows callingGetBranch("electron_pt")and returns the pointer to the sub-branch of the first main branch (i.e.el1.electron_pt). This behaviour can lead to ambiguities, thus avoid exposing the ambiguous column name via RDF.A test is added to exemplify this case.
This PR fixes #19392
Note that it is a draft PR as the fix is fairly obvious but I am not sure that it won't break other tests