Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7236#discussion_r33977873
--- Diff:
unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java ---
@@ -207,6 +207,78 @@ public boolean equals(final Object other) {
}
}
+ private char charAt(int bytePos) {
+ int num = numBytes(bytes[bytePos]);
+ if (num == 1) return (char) bytes[bytePos];
+ int l = bytes[bytePos] & 0x000F;
+ l = l << 8 + num + 1 >> 8 + num + 1;
+ for (int i = 1; i < num; i++) {
+ l = l << 6;
+ l = l | (0x003F & bytes[bytePos + i]);
+ }
+ return (char) l;
+ }
+
+ public int levenshteinDistance(UTF8String other) {
+ // Implementation adopted from
org.apache.common.lang3.StringUtils.getLevenshteinDistance
+
+ int n = length();
+ int m = other.length();
+
+ if (n == 0) {
+ return m;
+ } else if (m == 0) {
+ return n;
+ }
+
+ UTF8String s;
+ UTF8String t;
+
+ if (n <= m) {
+ s = this;
+ t = other;
+ } else {
+ s = other;
+ t = this;
+ n = s.length();
+ m = t.length();
+ }
+
+ int p[] = new int[n + 1];
--- End diff --
actually this one is probably ok -- I think JIT with the proper escape
analysis can do on-stack allocation for this.
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