Github user davies commented on a diff in the pull request: https://github.com/apache/spark/pull/7236#discussion_r34223127 --- Diff: unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java --- @@ -254,6 +254,67 @@ public boolean equals(final Object other) { } } + /** + * Levenshtein distance is a metric for measuring the distance of two strings. The distance is + * defined by the minimum number of single-character edits (i.e. insertions, deletions or + * substitutions) that are required to change one of the strings into the other. + */ + public int levenshteinDistance(UTF8String other) { + // Implementation adopted from org.apache.common.lang3.StringUtils.getLevenshteinDistance + + int n = numChars(); + int m = other.numChars(); + + if (n == 0) { + return m; + } else if (m == 0) { + return n; + } + + UTF8String s, t; + + if (n <= m) { + s = this; + t = other; + } else { + s = other; + t = this; + n = s.numChars(); --- End diff -- It's better to swap n and m, because `numChar()` is not cheap.
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