[GitHub] flink pull request #4127: [FLINK-6892][table]Add L/RPAD supported in SQL

[twalthr <gi...@git.apache.org>]

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

    https://github.com/apache/flink/pull/4127#discussion_r127995434
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/runtime/functions/ScalarFunctions.scala ---
    @@ -82,4 +82,102 @@ object ScalarFunctions {
         }
         sb.toString
       }
    +
    +  /**
    +    * Returns the string str, left-padded with the string pad to a length of len characters.
    +    * If str is longer than len, the return value is shortened to len characters.
    +    */
    +  def lpad(base: String, len: Integer, pad: String): String = {
    +    if (base == null || len == null || pad == null) {
    +      return null
    +    }
    +    var data = "".getBytes
    +    if (data.length < len) {
    +      data = new Array[Byte](len)
    +    }
    +    val baseBytes = base.getBytes
    +    val padBytes = pad.getBytes
    +
    +    // The length of the padding needed
    +    val pos = Math.max(len - base.length, 0)
    +
    +    // Copy the padding
    +    var i = 0
    +
    +    while (i < pos) {
    +      {
    --- End diff --
    
    Is this code auto-generated? It looks weird.


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