Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21123
@HyukjinKwon, I don't think there has been a discussion about how v1 and v2
compatibility will work. Discussion on #22009 brought up one aspect of it:
whether v2 sources should be passed a `SaveMode` if we agree that data
overwrites or table replacement should be done with the proposed logical plans.
I think it would be valuable to have a general discussion on the roadmap
from v1 to v2 on the dev list.
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