I need to add about 40 some odd files into a TChain (read-only), the total number of events should be about 2.5 billion. However, somehow function GetEntries always return 1234567890. The following is the documentation on this function:
Long64_t GetEntries() const
Return the total number of entries in the chain. In case the
number of entries in each tree is not yet known, the offset table
Since I am only reading the files, the number of entries should be known already, right? Any suggestion as how I would figure out exactly how many entries are there?