Github user gengliangwang commented on the issue:
https://github.com/apache/spark/pull/21029
+1
From the PR #20933, we can see that there is a lot of common code between
`DataReaderFactory[ColumnarBatch]` and `DataReaderFactory[UnsafeRow]`, if we
use the current method factory pattern.
This change makes data source implementation easier, and we don't need to
do runtime type cast.
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