Github user xuchuanyin commented on the issue:
https://github.com/apache/carbondata/pull/2255
Can you explain the meaning of `deferred rebuild`?
The data of datamap will be updated only after we fire the `rebuild`
statement?
Do we need to do it only once or have to do it multiple times?
For a datamap that is not deferred, what will happen if we call `rebuild`
on it?---
