[SPARK-19256][SQL] Remove ordering enforcement from `FileFormatWriter` and let planner do that#20206

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tejasapatil wants to merge 3 commits intoapache:masterfrom

tejasapatil:refac_sort_req

Commits on Jan 9, 2018

[SPARK-19256][SQL] Move bucketing constraints out of `FileFormatWriter` into `RunnableCommand`
tejasapatil
committed

Commits on Jan 10, 2018

override requiredOrdering for InsertIntoHiveTable
tejasapatil
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requiredOrdering for InsertIntoHiveTable to only consider static partitions
tejasapatil
committed