[SPARK-21677][SQL] json_tuple throws NullPointException when column is null as string type#18930

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jmchung wants to merge 11 commits intoapache:masterfrom

jmchung:SPARK-21677

Commits on Aug 12, 2017

Commits on Aug 13, 2017

Commits on Aug 14, 2017

discard fake field name, apply Option instead
jmchung
committed

Commits on Aug 15, 2017

added unit test that mixes constant field name and non constant one field name
jmchung
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use IndexedSeq instead of Array on foldableFieldNames to get better performance
jmchung
committed
remove redundant comment and move toIndexedSeq after the map
jmchung
committed

Commits on Aug 16, 2017

move test case from JsonSuite to JsonExpressionsSuite and add new test case in json-functions.sql
jmchung
committed

Commits on Aug 17, 2017