Github user zsxwing commented on the issue:
    > You should not be assuming 0 for a starting offset for partitions you've 
just learned about. You should be asking the underlying driver consumer what 
its position is.
    Yes, there are two approaches for getting new partitions' offsets:
    1. From a user perspective, if I set “auto.offset.reset” to latest, I 
would like to process new data after the query starts. So we should start from 
the earliest offset for a new partition.
    2. Follow `auto.offset.reset` as what you did in your fork.
    However, option 2 makes the query result indeterminate when 
`auto.offset.reset` is latest, depends on how the query runs. E.g., if you add 
new partitions and push new data very quickly, the new data may be lost; if you 
add new partitions and push new data when the app is being recovered, the new 
data may be lost as well.

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