[SPARK-20090][PYTHON] Add StructType.fieldNames in PySpark#18618

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HyukjinKwon wants to merge 3 commits intoapache:masterfrom

HyukjinKwon:SPARK-20090

Commits on Jul 13, 2017

Add StructType.fieldNames in PySpark
HyukjinKwon
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Commits on Jul 15, 2017

Make the return type to a list instead of a tuple
HyukjinKwon
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Commits on Jul 21, 2017

Add a note for deprecation for names attribute in StructType
HyukjinKwon
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