Kazuaki Ishizaki created SPARK-22746:
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             Summary: Avoid the generation of useless mutable states by 
SortMergeJoin
                 Key: SPARK-22746
                 URL: https://issues.apache.org/jira/browse/SPARK-22746
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.3.0
            Reporter: Kazuaki Ishizaki


Generated code in {{SortMergeJoin}} uses global mutable variables to extend 
lifetime of variables in a nested loop. The generated code can use local 
variables instead of global mutable variables.



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