cloud-fan edited a comment on issue #24546: [SPARK-27650][SQL] separate the row iterator functionality from ColumnarBatch URL: https://github.com/apache/spark/pull/24546#issuecomment-490723477 > The PR description just says that this avoids referring to MutableColumnarRow in the new class This avoids referring to `MutableColumnarRow` in the old class(`ColumnarBatch`), so that `ColumnarBatch` does not refer to any internal classes and can be moved to the catalyst package. The related functionality that needs `MutableColumnarRow` is moved the new class `ColumnarBatchRowView `, and the new class is internal. @rdblue please let me know if you need further explanation. @kiszk The responsibility of `ColumnarBatch` is just to carry the columnar data to Spark. We can make it an interface, but I'd image all the people will have very similar implementations. I think it's better to keep it as a class, and users can use it directly.
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