Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/1586#issuecomment-50427397
```
scala> val a = "\uF93D\uF936\uF949\uF942"
a: String = ????
scala> a.getBytes("UTF-8").length
res2: Int = 12
scala> a.length
res4: Int = 4
```
It's works the same as you wrote in `Strlen`
```
string.asInstanceOf[String].getBytes(strEncoding).length
```
I am not sure why you try to get the bytes length for `Strlen`. Seems not
reasonable.
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