[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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[GitHub] [spark] SparkQA commented on pull request #29041: [SPARK-20680][SQL][FOLLOW-UP] Revert NullType.simpleString from 'unknown' to 'null'

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