Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/9940#issuecomment-160361925
@liancheng the naming might a little confusing. It means that the fields
only exist in one of the merging schemas. For example, when we want to merge
two schema: {a: Int, b: String, c: Double} and {a: Int, c: Double}, then the b:
String is only existing in one schema.
In other words, this patch tried to mark the differences between merged
schemas.
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