Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21319
> but in the first pass I see that it breaks equality by relying on a
user-supplied reader instance.
Can you say more about this? I explicitly mentioned it in the PR
description that
> keep DataSourceReader as an optional parameter in the constructor of
DataSourceV2Relation, exclude it in the equality definition but include it when
copying.
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