Github user davies commented on the pull request:
https://github.com/apache/spark/pull/7197#issuecomment-119067259
@JoshRosen One comment about the String.length, it's not the number of
characters ( but code point units instead), so we can't use
`UTF8String.fromString(s).substring(0, s.length)`. UTF8String.numChars() is the
number of characters. So `strlen` will have different results than Hive (for
some special characters). cc @rxin
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