Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/2542#issuecomment-57074476
@tianyi
CREATE TABLE t1(x INT);
CREATE TABLE t2(a STRUCT<x: INT>, k INT);
SELECT a.x FROM t1 a JOIN t2 b ON a.x = b.k;
But hive can resolve this as @liancheng said. What's the magic here for the
`ON` statement?
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