Github user marmbrus commented on the issue:
    > Either way, who are you to presume that a user doesn't know what she is
    doing when she configured a consumer to start at a particular position for
    an added partition?
    I feel like we are talking past each other.  We are not giving the 
developer the option to manually configure a consumer in this way for this PR 
precisely because I don't think we can while still maintaining the semantics 
that structured streaming has promised.  This is consciously a higher level API 
than is provided by DStreams.  Neither of these is right or wrong. I do want to 
be able to support as many real use cases as possible in the Structured 
Streaming API, but not at the expense of correctness for the queries that we 
support. If there are low level use cases that we can't support, which require 
users to use DStreams instead, that is okay, as it is okay that some users 
still program against RDDs.

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