Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
    @@ -175,14 +187,18 @@ object JdbcUtils extends Logging {
           } finally {
    -      conn.commit()
    +      if (supportsTransactions) {
    +        conn.commit()
    --- End diff --
    When the dataFrame has duplicate keys and the target tables have the unique 
constraints, we could see the non-deterministic results at the target tables, 
since some partitions containing duplicate keys could be rolled back.

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