Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/19222#discussion_r171590147
--- Diff:
common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java ---
@@ -273,6 +286,7 @@ public long getPrefix() {
* @param until the position after last code point, exclusive.
*/
public UTF8String substring(final int start, final int until) {
+ int numBytes = numBytes();
--- End diff --
Got it. I will leave this decision in the comment.
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