Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/20387
> We've added a resolution rule from UnresolvedRelation to
DataSourceV2Relation that uses our implementation. UnresolvedRelation needs to
pass its TableIdentifier to the v2 relation, which is why I added this.
I've been thinking about this a little more. This is actually an existing
problem for file-based data sources. The solution is, when converting an
unresolved relation to data source relation, we add some new options to the
existing data source options before passing the options to data source
relation. See `FindDataSourceTable.readDataSourceTable` about how we handle the
path option.
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