cloud-fan commented on issue #24546: [SPARK-27650][SQL] separate the row iterator functionality from ColumnarBatch URL: https://github.com/apache/spark/pull/24546#issuecomment-491302818 @rdblue that's a good point. I checked the code base, `MutableColumnarRow` does need to be mutable, when it's used in `HashAggregateExec`. But the row returned by `ColumnarBatch.rowIterator` doesn't need to be mutable. Let me create a special row to replace `MutableColumnarRow` in `ColumnarBatch`.
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