Add event histograms after split collision removal

Author: ayatsuji

PWGDQ/Tasks/tableReader_withAssoc.h

@@ -1366,6 +1366,10 @@ struct AnalysisSameEventPairing {
     // TODO: Add pair cuts via JSON
   } fConfigCuts;
 
+  //add event level histograms after remove collision splitting candidates
+  o2::framework::Configurable<std::string> fConfigAddEventHistogram{"cfgAddEventHistogram", "", "Comma separated list of histograms,only used after turn on the cfgRemoveCollSplittingCandidates option"};
+  o2::framework::Configurable<std::string> fConfigAddJSONEventHistograms{"cfgAddJSONEventHistograms", "", "Event histograms in JSON format,only used after turn on the cfgRemoveCollSplittingCandidates option"};
+
   o2::framework::Configurable<int> fConfigMixingDepth{"cfgMixingDepth", 100, "Number of Events stored for event mixing"};
   o2::framework::Configurable<std::string> fConfigMixingVariables{"cfgMixingVars", "", "Mixing configs separated by a comma, default no mixing"};
   o2::framework::Configurable<std::string> fConfigMixingVariablesJson{"cfgMixingVarsJSON", "", "Mixing configs in JSON format"};
@@ -1814,6 +1818,10 @@ struct AnalysisSameEventPairing {
       fHistMan->SetUseDefaultVariableNames(true);
       fHistMan->SetDefaultVarNames(dqtablereader_helpers::varNames(), dqtablereader_helpers::varUnits());
       VarManager::SetCollisionSystem((TString)fConfigOptions.collisionSystem, fConfigOptions.centerMassEnergy); // set collision system and center of mass energy
+      if (fConfigCuts.event.value) {
+        DefineHistograms(fHistMan, "EventafterSplitCollisionRemoval",fConfigAddEventHistogram.value.data()); // define event histograms after removing collision splitting candidates
+        o2::aod::dqhistograms::AddHistogramsFromJSON(fHistMan, fConfigAddJSONEventHistograms.value.c_str());
+      }
       DefineHistograms(fHistMan, histNames.Data(), fConfigAddSEPHistogram.value.data());                        // define all histograms
       if (fEnableBarrelHistos) {
         DefineHistograms(fHistMan, "PairingSEQA", "sameevent-pairing"); // histograms for QA of the pairing
@@ -2007,6 +2015,11 @@ struct AnalysisSameEventPairing {
       // VarManager::FillEvent<gkEventFillMap>(event, dqtablereader_helpers::varValues());
       VarManager::FillEvent<TEventFillMap>(event, dqtablereader_helpers::varValues());
 
+      //fill the event histograms
+      if (fConfigQA && fConfigCuts.event) {
+        fHistMan->FillHistClass("EventafterSplitCollisionRemoval", dqtablereader_helpers::varValues());
+      }
+
       auto groupedAssocs = assocs.sliceBy(preslice, event.globalIndex());
       if (groupedAssocs.size() == 0) {
         continue;