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## What changes were proposed in this pull request? Remove the alias parameter in `UnresolvedRelation`, and use `SubqueryAlias` to replace it. This can simplify some `match case` situations. For example, the broadcast hint pull request can have one fewer case https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveHints.scala#L57-L61 ## How was this patch tested? add some unit tests Author: windpiger <songjun@outlook.com> Closes #16956 from windpiger/removeUnresolveTableAlias. |
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