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[SPARK-10539] [SQL] Project should not be pushed down through Interse…
…ct or Except apache#8742 Intersect and Except are both set operators and they use the all the columns to compare equality between rows. When pushing their Project parent down, the relations they based on would change, therefore not an equivalent transformation. JIRA: https://issues.apache.org/jira/browse/SPARK-10539 I added some comments based on the fix of apache#8742. Author: Yijie Shen <henry.yijieshen@gmail.com> Author: Yin Huai <yhuai@databricks.com> Closes apache#8823 from yhuai/fix_set_optimization.
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