[SPARK-17357][SQL] Fix current predicate pushdown#14912

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viirya wants to merge 3 commits intoapache:masterfrom

viirya:simplified-predicate-pushdown

Commits on Sep 1, 2016

Simplified predicates should be pushdown.
viirya
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Commits on Sep 5, 2016

Address comment. Consider more general case.
viirya
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Commits on Sep 13, 2016

Focus on the first problem of predicate pushdown.
viirya
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