@Override
  public void writeAlignedRow(
      IDeviceID deviceId,
      List<IMeasurementSchema> schemaList,
      long insertTime,
      Object[] objectValue) {
    IWritableMemChunkGroup memChunkGroup =
        createAlignedMemChunkGroupIfNotExistAndGet(deviceId, schemaList);
    memChunkGroup.writeRow(insertTime, objectValue, schemaList);
  }
Create this MemChunk if it's not exist.

@param deviceId device id
@param schemaList measurement schemaList
@return this MemChunkGroup
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/memtable/AbstractMemTable.java