Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/2542#issuecomment-58338302
I tried this on hive:
CREATE TABLE t1(x INT);
CREATE TABLE t2(a STRUCT<x: INT>, k INT);
SELECT a.x FROM t1 a JOIN t2 b;
And hive can resolve this. However it is reasonable to report "ambiguous
references" here, should we follow hive for this case?
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