[SPARK-18137][SQL]Fix RewriteDistinctAggregates UnresolvedException when a UDAF has a foldable TypeCheck#15668

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windpiger:RewriteDistinctUDAFUnresolveExcep

Commits on Oct 28, 2016

[SPARK-18137][SQL]Fix RewriteDistinctAggregates UnresolvedException when the UDAF has a foldable TypeCheck

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Commits on Nov 7, 2016

if distinct agg only has foldable children,it will expand the first child;if has unfoldable children,it will only expand the unfoldable children

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fix some code style

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fix some code style

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Commits on Nov 8, 2016

fix a code style

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