Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/16481
I think it's time to think about why `DataSource.write` should return
`BaseRelation`. It seems that we only use it in
`CreateDataSourceTableAsSelect`, to get the schema of the written data, only
for nullability changes. Can we avoid doing this? Can we figure out the
nullability changes more concisely?
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