Github user arina-ielchiieva commented on the pull request:
https://github.com/apache/drill/pull/474#issuecomment-208557847
If we add new type to version 1.7, it can't work with version 1.6 where
this type is absent, that's why I am adding support only for +1 version. At
this point in my implementation, 1.6 can work with 1.6 and 1.7. 1.7 can work
with 1.7 and 1.8.
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