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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