Josh Rosen created SPARK-9364:
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             Summary: Properly update `freeSpaceInCurrentPage` in 
UnsafeExternalSorter
                 Key: SPARK-9364
                 URL: https://issues.apache.org/jira/browse/SPARK-9364
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 1.5.0
            Reporter: Josh Rosen
            Assignee: Josh Rosen


UnsafeExternalSorter does not properly update {{freeSpaceInCurrentPage}}, which 
can cause it to write past the end of memory pages and trigger segfaults.



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