[SPARK-4250] [SQL] Fix bug of constant null value mapping to ConstantObjectInspector#3114

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chenghao-intel wants to merge 3 commits intoapache:masterfrom

chenghao-intel:constant_null_oi

Commits on Nov 5, 2014

fix bug of constant null value for ObjectInspector
chenghao-intel
committed

Commits on Nov 6, 2014

fix the timezone issue
chenghao-intel
committed

Commits on Nov 8, 2014

fix the bug of null value for primitive types
chenghao-intel
committed