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[SPARK-8830] [SQL] native levenshtein distance
Jira: https://issues.apache.org/jira/browse/SPARK-8830 rxin and HuJiayin can you have a look on it. Author: Tarek Auel <tarek.auel@googlemail.com> Closes #7236 from tarekauel/native-levenshtein-distance and squashes the following commits: ee4c4de [Tarek Auel] [SPARK-8830] implemented improvement proposals c252e71 [Tarek Auel] [SPARK-8830] removed chartAt; use unsafe method for byte array comparison ddf2222 [Tarek Auel] Merge branch 'master' into native-levenshtein-distance 179920a [Tarek Auel] [SPARK-8830] added description 5e9ed54 [Tarek Auel] [SPARK-8830] removed StringUtils import dce4308 [Tarek Auel] [SPARK-8830] native levenshtein distance
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala 4 additions, 5 deletions...che/spark/sql/catalyst/expressions/stringOperations.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/StringFunctionsSuite.scala 5 additions, 0 deletions...spark/sql/catalyst/expressions/StringFunctionsSuite.scala
- unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java 64 additions, 2 deletions...c/main/java/org/apache/spark/unsafe/types/UTF8String.java
- unsafe/src/test/java/org/apache/spark/unsafe/types/UTF8StringSuite.java 24 additions, 0 deletions...t/java/org/apache/spark/unsafe/types/UTF8StringSuite.java
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