Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/7830#discussion_r36028899
--- Diff:
unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java ---
@@ -414,7 +413,7 @@ public int indexOf(UTF8String v, int start) {
*/
public UTF8String rpad(int len, UTF8String pad) {
int spaces = len - this.numChars(); // number of char need to pad
- if (spaces <= 0) {
+ if (spaces <= 0 || pad.numChars() == 0) {
// no padding at all, return the substring of the current string
return substring(0, len);
--- End diff --
use numBytes
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