Github user rdblue commented on the pull request:
https://github.com/apache/spark/pull/12313#issuecomment-222231124
@yhuai, I'll add an option for strict checking.
I agree with you that we need to have a holistic solution. It's also not
ideal that some write methods already map by name while others don't. That's a
good argument against adding the `byName` modifier because it should apply to
how anything is written using that `DataFrameWriter`.
What do you think about combining the two by adding a `insertByNameInto`
method? That way we preserve the behavior of `insertInto` but make it clear by
way of contrast that there are other options. Then we also don't have a
`byName` method that doesn't make sense with the current behavior of
`saveAsTable`.
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