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[SPARK-2908] [SQL] JsonRDD.nullTypeToStringType does not convert all NullType to StringType#1840

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yhuai wants to merge 2 commits intoapache:masterapache/spark:masterfrom

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[SPARK-2908] [SQL] JsonRDD.nullTypeToStringType does not convert all NullType to StringType#1840
yhuai wants to merge 2 commits intoapache:masterfrom
yhuai:SPARK-2908

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Commits on Aug 7, 2014

nullTypeToStringType should check columns with the type of array of structs.
yhuai
committed
Update test.
yhuai
committed

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