[GitHub] [spark] xuanyuanking commented on a change in pull request #28937: [SPARK-32115][SQL] Fix SUBSTRING to handle integer overflows

[GitBox <gi...@apache.org>]

xuanyuanking commented on a change in pull request #28937:
URL: https://github.com/apache/spark/pull/28937#discussion_r447484628



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File path: common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java
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@@ -341,8 +341,17 @@ public UTF8String substringSQL(int pos, int length) {
     // to the -ith element before the end of the sequence. If a start index i is 0, it
     // refers to the first element.
     int len = numChars();
+    // `len + pos` does not overflow as `len >= 0`.

Review comment:
       Thanks for reviewing!




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