private void compactSegments() {
    this.rearrangeSegments((short) -1);
  }
To compact segments further, set deleted segments offset to -1 It modifies pageSpareOffset if
more space released. Over-write stash segments with existed segments.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/schemafile/SegmentedPage.java