private void clearAllTableContainers() {
    if (mapJoinTables != null) {
      for (MapJoinTableContainer tableContainer : mapJoinTables) {
        if (tableContainer != null) {
          tableContainer.clear();
        }
      }
    }
  }
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