[2.4] revert [SPARK-26021][SQL] replace minus zero with zero in Platform.putDouble/Float#23389

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cloud-fan wants to merge 2 commits intoapache:branch-2.4from cloud-fan:revert

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Commits on Dec 27, 2018

Revert "[SPARK-26021][2.4][SQL][FOLLOWUP] only deal with NaN and -0.0 in UnsafeWriter"
cloud-fan
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Revert "[SPARK-26021][SQL] replace minus zero with zero in Platform.putDouble/Float"
cloud-fan
committed