public void invokeLastLeaf(ISchemaPage page) {
    // only record at the first split
    if (lastLeafPage == null) {
      lastLeafPage = page.getAsSegmentedPage();
    }
  }
Since records are ordered for write operation, it is reasonable to flush those left siblings of
the active leaf page. The target page would be initiated at the first split within the
operation.

@param page left leaf of the split
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/schemaengine/schemaregion/mtree/impl/pbtree/schemafile/pagemgr/SchemaPageContext.java