spark git commit: [SPARK-18251][SQL] the type of Dataset can't be Option of non-flat type

Repository: spark Updated Branches: refs/heads/branch-2.1 f542df310 -> 9e96ac5a9 [SPARK-18251][SQL] the type of Dataset can't be Option of non-flat type ## What changes were proposed in this pull request? For input object of non-flat type, we can't encode it to row if it's null, as Spark

spark git commit: [SPARK-18251][SQL] the type of Dataset can't be Option of non-flat type

Repository: spark Updated Branches: refs/heads/master 60022bfd6 -> f135b70fd [SPARK-18251][SQL] the type of Dataset can't be Option of non-flat type ## What changes were proposed in this pull request? For input object of non-flat type, we can't encode it to row if it's null, as Spark SQL