[SPARK-24906][SQL] Adaptively enlarge split / partition size for Parq…#21868

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Commits on Aug 17, 2018

[SPARK-24906][SQL] Adaptively enlarge split / partition size for Parquet and Orc
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[SPARK-24906][SQL] Adaptively enlarge split / partition size for Parquet and Orc. Change parquet to columnar
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