[SPARK-20703][SQL][WIP] Add an operator for writing data out#17998

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viirya:SPARK-20703

Commits on May 14, 2017

Add an operator for writing data out.
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Commits on May 15, 2017

Set metrics for file-based relation.
viirya
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Commits on May 16, 2017

Add tests for writing data metrics.
viirya
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