Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/4127#discussion_r127995503
--- 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) {
+ {
+ var j = 0
+ while (j < pad.length && j < pos - i) {
+ {
+ data(i + j) = padBytes(j)
+ }
+ {
+ j += 1;
+ j - 1
--- End diff --
Isn't this expression useless?
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