Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/2542#issuecomment-57073139
@liancheng Hmm..I don't have a hive environment for test...
CREATE TABLE t1(x INT);
CREATE TABLE t2(a STRUCT<x: INT>, k INT);
SELECT a.x FROM t1 a JOIN t2 b;
Without this PR, spark sql will report ambiguousReferences, but how hive
resolve `a.x`? "table a, column x" or "table b, column a.x"?
Or do we have to add the `ON` statement?
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