hugegraph-mysql/src/main/java/org/apache/hugegraph/backend/store/mysql/MysqlTables.java [400:423]:
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        public BackendEntry mergeEntries(BackendEntry e1, BackendEntry e2) {
            // Merge edges into vertex
            // TODO: merge rows before calling row2Entry()

            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);
        }
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hugegraph-palo/src/main/java/org/apache/hugegraph/backend/store/palo/PaloTables.java [268:291]:
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        protected BackendEntry mergeEntries(BackendEntry e1, BackendEntry e2) {
            // Merge edges into vertex
            // TODO: merge rows before calling row2Entry()

            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);
        }
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