private void createMatchTracker(MapJoinTableContainer smallTable) {
    ReusableGetAdaptor hashMapRowGetter = smallTable.createGetter(null);
    matchTracker =
        ((ReusableGetAdaptorDirectAccess) hashMapRowGetter).createMatchTracker();
    Preconditions.checkState(matchTracker != null);
  }
Postpone processing the big table row temporarily by spilling it to a row container
@param hybridHtContainer Hybrid hashtable container
@param row big table row
ql/src/java/org/apache/hadoop/hive/ql/exec/MapJoinOperator.java