Github user NathanHowell commented on the pull request:
https://github.com/apache/spark/pull/5801#issuecomment-98947593
@rxin It supports writing a UTF8 encoding byte array, but there doesn't
seem to be equivalent support for reads.. best that can be done is converting
the current `char[]` buffer and offset/length directly to a `byte[]`, avoiding
an alloc/copy to `String`.
see:
http://fasterxml.github.io/jackson-core/javadoc/2.3.0/com/fasterxml/jackson/core/base/ParserMinimalBase.html#getTextCharacters()
and
http://fasterxml.github.io/jackson-core/javadoc/2.3.0/com/fasterxml/jackson/core/JsonGenerator.html#writeUTF8String(byte[],
int, int)
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