tableReader: only reserve ditracks table size for assocs passing cuts

Author: sigurdnese

PWGDQ/Tasks/tableReader_withAssoc.h

@@ -3574,16 +3574,21 @@ struct AnalysisAsymmetricPairing {
     // Reserve capacity for the output tables
     int64_t reserveSize = 0;
     for (auto const& event : events) {
-      if (!event.isEventSelected_bit(0)) {
-        continue;
-      }
-      if (fConfigRemoveCollSplittingCandidates.value && event.isEventSelected_bit(2)) {
-        continue;
-      }
       auto groupedLegAAssocs = legACandidateAssocs.sliceBy(preslice, event.globalIndex());
       auto groupedLegBAssocs = legBCandidateAssocs.sliceBy(preslice, event.globalIndex());
-      reserveSize += static_cast<int64_t>(groupedLegAAssocs.size()) *
-                     static_cast<int64_t>(groupedLegBAssocs.size());
+      size_t nGoodA = 0;
+      size_t nGoodB = 0;
+      for (auto const& t : groupedLegAAssocs) {
+        if (t.isBarrelSelected_raw()) {
+          nGoodA++;
+        }
+      }
+      for (auto const& t : groupedLegBAssocs) {
+        if (t.isBarrelSelected_raw()) {
+          nGoodB++;
+        }
+      }
+      reserveSize += nGoodA * nGoodB;
     }
     ditrackList.reserve(reserveSize);
     ditrackExtraList.reserve(reserveSize);