Since I need to check the empty value of the time series stored in Apache IoTDB, I would like to ask is there any function for interpolation query when querying data in IoTDB? If there is this kind of function, what should I do to check all these empty fields out?
In Apache IoTDB, you can directly replace the empty fields with the value you want (previous value, linear interpolation of the previous non-null value and the next non-null value, or a certain constant), instead of query them out and then try to replace them.
To achieve this, try FILL '(' PREVIOUS | LINEAR | constant ')' command and choose the kind of filling value method you want.