[SPARK-19598] Remove the alias parameter in UnresolvedRelation

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.2.0
• Fix Version/s: 2.2.0
• Component/s: SQL
• Assignee: Song Jun
• Reporter: Reynold Xin
• Created: 14/Feb/17 19:06
• Updated: 20/Feb/17 00:52
• Resolved: 20/Feb/17 00:52

Description

UnresolvedRelation has a second argument named "alias", for assigning the relation an alias. I think we can actually remove it and replace its use with a SubqueryAlias.

This would actually simplify some analyzer code to only match on SubqueryAlias. For example, the broadcast hint pull request can have one fewer case https://github.com/apache/spark/pull/16925/files.

Issue Links

• links to: [Github] Pull Request #16956 (windpiger)