Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/2542#issuecomment-57039692
@cloud-fan Tried the following snippet with ambiguous references in Hive:
```sql
CREATE TABLE t1(a STRUCT<x: INT>, k INT);
CREATE TABLE t2(x INT);
SELECT a.x FROM t1 a JOIN t2 b ON a.k = b.x;
```
and Hive reports "Invalid column reference 'x'", which I think is
reasonable. So it seems that Hive treats struct fields and table columns
equally.
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