Github user jackieMaKing commented on the pull request:
https://github.com/apache/spark/pull/9649#issuecomment-156308518
Call toArray(T[] a) in Java List to cast List to a specific type Array,
thus I create a zero-length array. @srowen what do you mean, better to create
an array with the same length of the list to pass to toArray? Like this
"StructType(fields.toArray(new Array[StructField](fields.size())))"
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