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[SPARK-27675][SQL] do not use MutableColumnarRow in ColumnarBatch
## What changes were proposed in this pull request? To move DS v2 API to the catalyst module, we can't refer to an internal class (`MutableColumnarRow`) in `ColumnarBatch`. This PR creates a read-only version of `MutableColumnarRow`, and use it in `ColumnarBatch`. close apache#24546 ## How was this patch tested? existing tests Closes apache#24581 from cloud-fan/mutable-row. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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