@Override
  public short getSpareSize() {
    return spareSize;
  }
Implementing marking deletion will not modify {@linkplain #memberNum} nor truncate {@linkplain
#segOffsetLst}.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/schemafile/SegmentedPage.java