public void setEvictionUpperBound(int evictionUpperBound) {
    this.evictionUpperBound = evictionUpperBound;
  }
Set the upper bound.

@param evictionUpperBound the index of the first element that cannot be evicted. in other
    words, elements whose index are <b>less than</b> the evictionUpperBound can be evicted.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/transformation/datastructure/row/ElasticSerializableRowList.java