hugegraph-mysql/src/main/java/org/apache/hugegraph/backend/store/mysql/MysqlTables.java [404:437]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
            MysqlBackendEntry current = (MysqlBackendEntry) e1;
            MysqlBackendEntry next = (MysqlBackendEntry) e2;

            E.checkState(current == null || current.type().isVertex(),
                         "The current entry must be null or VERTEX");
            E.checkState(next != null && next.type().isEdge(),
                         "The next entry must be EDGE");

            long maxSize = BackendEntryIterator.INLINE_BATCH_SIZE;
            if (current != null && current.subRows().size() < maxSize) {
                Id nextVertexId = IdGenerator.of(
                                  next.<String>column(HugeKeys.OWNER_VERTEX));
                if (current.id().equals(nextVertexId)) {
                    current.subRow(next.row());
                    return current;
                }
            }

            return this.wrapByVertex(next);
        }

        private MysqlBackendEntry wrapByVertex(MysqlBackendEntry edge) {
            assert edge.type().isEdge();
            String ownerVertex = edge.column(HugeKeys.OWNER_VERTEX);
            E.checkState(ownerVertex != null, "Invalid backend entry");
            Id vertexId = IdGenerator.of(ownerVertex);
            MysqlBackendEntry vertex = new MysqlBackendEntry(HugeType.VERTEX,
                                                             vertexId);

            vertex.column(HugeKeys.ID, ownerVertex);
            vertex.column(HugeKeys.PROPERTIES, "");

            vertex.subRow(edge.row());
            return vertex;
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



hugegraph-palo/src/main/java/org/apache/hugegraph/backend/store/palo/PaloTables.java [272:305]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
            MysqlBackendEntry current = (MysqlBackendEntry) e1;
            MysqlBackendEntry next = (MysqlBackendEntry) e2;

            E.checkState(current == null || current.type().isVertex(),
                         "The current entry must be null or VERTEX");
            E.checkState(next != null && next.type().isEdge(),
                         "The next entry must be EDGE");

            long maxSize = BackendEntryIterator.INLINE_BATCH_SIZE;
            if (current != null && current.subRows().size() < maxSize) {
                Id nextVertexId = IdGenerator.of(
                                  next.<String>column(HugeKeys.OWNER_VERTEX));
                if (current.id().equals(nextVertexId)) {
                    current.subRow(next.row());
                    return current;
                }
            }

            return this.wrapByVertex(next);
        }

        private MysqlBackendEntry wrapByVertex(MysqlBackendEntry edge) {
            assert edge.type().isEdge();
            String ownerVertex = edge.column(HugeKeys.OWNER_VERTEX);
            E.checkState(ownerVertex != null, "Invalid backend entry");
            Id vertexId = IdGenerator.of(ownerVertex);
            MysqlBackendEntry vertex = new MysqlBackendEntry(HugeType.VERTEX,
                                                             vertexId);

            vertex.column(HugeKeys.ID, ownerVertex);
            vertex.column(HugeKeys.PROPERTIES, "");

            vertex.subRow(edge.row());
            return vertex;
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -