[SPARK-16664][SQL] Fix persist call on Data frames with more than 200…#14324

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Commits on Jul 23, 2016

[SPARK-16664][SQL] Fix persist call on Data frames with more than 200 columns is wiping out the data.
Wesley Tang
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[SPARK-16664] Add test
Wesley Tang
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Update tests
Wesley Tang
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Commits on Jul 26, 2016

Fix style
Wesley Tang
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