[GitHub] [spark] cloud-fan opened a new pull request #24546: [SPARK-27650][SQL] sepate the row iterator functionality from ColumnarBatch

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cloud-fan opened a new pull request #24546: [SPARK-27650][SQL] sepate the row iterator functionality from ColumnarBatch
URL: https://github.com/apache/spark/pull/24546
 
 
   ## What changes were proposed in this pull request?
   
   `ColumnarBatch` is user-facing, we should expose as fewer details as possible.
   
   `ColumnarBatch` is used to carry the data from data source to Spark. Accessing the data in a row-wise style is not its responsibility.
   
   This PR creates `ColumnarBatchRowView`, and moves the row iterator functionality from `ColumnarBatch` to `ColumnarBatchRowView`.
   
   This PR avoids referring to internal classes(MutableColumnarRow) in `ColumnarBatch`, so that we can move DS v2 APIs to catalyst module later in https://github.com/apache/spark/pull/24416
   
   ## How was this patch tested?
   
   existing tests

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