Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7534#discussion_r35070553
--- Diff:
unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java ---
@@ -165,6 +165,18 @@ public UTF8String substring(final int start, final int
until) {
return fromBytes(bytes);
}
+ public UTF8String substringSQL(int pos, int length) {
+ // Information regarding the pos calculation:
+ // Hive and SQL use one-based indexing for SUBSTR arguments but also
accept zero and
+ // negative indices for start positions. If a start index i is greater
than 0, it
+ // refers to element i-1 in the sequence. If a start index i is less
than 0, it refers
+ // to the -ith element before the end of the sequence. If a start
index i is 0, it
+ // refers to the first element.
+ int start = (pos > 0) ? pos -1 : ((pos < 0) ? numChars() + pos : 0);
--- End diff --
cc @davies also
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