[SPARK-16282][SQL] Implement percentile SQL function.#14136

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jiangxb1987 wants to merge 22 commits intoapache:masterfrom

jiangxb1987:percentile

Commits on Nov 22, 2016

Commits on Nov 23, 2016

rewrite Percentile using the TypedImperativeAggregate interface.
jiangxb1987
committed

Commits on Nov 24, 2016

fix class cast exception for output.
jiangxb1987
committed

Commits on Nov 25, 2016

Implement serializer for Percentile.
jiangxb1987
committed

Commits on Nov 26, 2016

Commits on Nov 28, 2016

revert Percentile to accept percentages in ArrayType(NumericType).
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committed