[TTreeReader] Partial leaf/branch names not recognized in cases that TTree::Draw supports #6881
Description
- Checked for duplicates
Describe the bug
First reported here.
For this TTree (the file is linked from the forum post):
root [12] DmpMCEvtNtup->Print("NUD_total_ADC*")
******************************************************************************
*Tree :DmpMCEvtNtup: DAMPE MC Event nTuple Tree *
*Entries : 30000 : Total = 42024515 bytes File Size = 5331016 *
* : : Tree compression factor = 7.90 *
******************************************************************************
*Br 0 :NUD_total_ADC : nud_total_adc/D *
*Entries : 30000 : Total Size= 241261 bytes File Size = 7509 *
*Baskets : 8 : Basket Size= 32000 bytes Compression= 32.06 *
*............................................................................*
DmpMCEvtNtup->Draw("NUD_total_ADC")
works, while
root [13] TTreeReader r(DmpMCEvtNtup);
root [14] TTreeReaderValue<double> rv(r, "NUD_total_ADC");
root [15] r.Next()
Error in <TTreeReaderValueBase::GetBranchDataType()>: The branch NUD_total_ADC was created using a leaf list and cannot be represented as a C++ type. Please access one of its siblings using a TTreeReaderArray:
Error in <TTreeReaderValueBase::GetBranchDataType()>: NUD_total_ADC.nud_total_adc
Error in <TTreeReaderValueBase::CreateProxy()>: The branch NUD_total_ADC contains data of type {UNDETERMINED TYPE}, which does not have a dictionary.
(bool) false
does not. TTreeReader instead requires the full leaf name:
root [1] TTreeReader r(DmpMCEvtNtup);
root [2] TTreeReaderValue<double> rv(r, "NUD_total_ADC.nud_total_adc");
root [3] r.Next()
(bool) true
root [4] *rv
(double) -999.00000
Expected behavior
TTreeReader should support the same set of "valid branch names" that TTree::Draw supports.
Setup
Reproduced with 6.22/02 and master@4ea4d8943 .
Additional context
This looks similar to https://sft.its.cern.ch/jira/browse/ROOT-7984 and it is (at least part of) the cause of https://sft.its.cern.ch/jira/browse/ROOT-9558 .