Github user Dooyoung-Hwang commented on the issue:
https://github.com/apache/spark/pull/22219
Dear reviewers (cc : @dongjoon-hyun )
I updated these.
1. No behavior changes, if the new config is off. So, [PR
SPARK-25353](https://github.com/apache/spark/pull/22347) is not required for
this PR anymore.
2. Apply review comments. (Define config as boolean, and do not add
function to DataSet.)
3. Add test case to test fetch_next & fetch_first.
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