[SPARK-19311][SQL] fix UDT hierarchy issue #16660

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Commits on Jan 20, 2017

fix UDT hierarchy issue https://issues.apache.org/jira/browse/SPARK-19311
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Commits on Jan 23, 2017

add test case for SPARK-19311. Test case still fails - cause from elsewhere?
gmoehler
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minor corrections of unit test case
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re-organize imports to satisfy Scalastyle checks
gmoehler
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re-organize imports to satisfy Scalastyle checks & add correct indendation & lf
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Commits on Jan 24, 2017

worked in comments regarding style & not required overrides
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Commits on Jan 25, 2017

remove unnecessary toString() method
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