Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/10753#issuecomment-171536438
When we have a database named "a", and two tables:
1. a table also named "a", and a struct column named "b", and a field in
the struct named "c".
2. a table named "b", and a column in it named "c"
What happens if the user specifies "a.b.c"?
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