Github user tianyi commented on the pull request:
https://github.com/apache/spark/pull/2542#issuecomment-56942258
@cloud-fan
I think we should follow some orders to resolve a.b
First, if 'a' match a table name or alias, then we recognize a as a table.
if 'a' did not match any table name or alias, then we expect 'a' should be
a structType column.
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