Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/6351#issuecomment-105484596
Get it. The root cause here is we moved `Filter Pushdown` before
`ConstantFolding` in
https://github.com/DoingDone9/spark/commit/4459514497eb76e6f2465d071857854390453805#diff-a636a87d8843eeccca90140be91d4fafL43,
then we can not simplify boolean condition before filter push down through
join, which leads to `CartesianProduct`.
i think this change is reasonable.
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