Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/2246#issuecomment-54572192
I don't think the concern about using `findTightestCommonType` with struct
types is valid. If the fields match up exactly we will return the type,
otherwise we will fall back on the advanced resolution logic.
Here is a PR (against your PR) that implements this and seems to pass all
our tests
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