Github user kiszk commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16086#discussion_r90482897
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
    @@ -236,6 +238,37 @@ class Dataset[T] private[sql](
           }
       }
     
    +  var EAST_ASIAN_LANGS = Seq("ja", "vi", "kr", "zh")
    +
    +  private def unicodeWidth(str: String): Int = {
    +    val locale = Locale.getDefault()
    +    if (locale == null) {
    +      throw new NullPointerException("locale is null")
    +    }
    +    val ambiguousLen = if 
(EAST_ASIAN_LANGS.contains(locale.getLanguage())) 2 else 1
    +    var len = 0
    +    for (i <- 0 until str.length) {
    +      val codePoint = str.codePointAt(i)
    +      val value = UCharacter.getIntPropertyValue(codePoint, 
UProperty.EAST_ASIAN_WIDTH);
    --- End diff --
    
    thanks, done


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