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https://issues.apache.org/jira/browse/SPARK-50772?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-50772:
-----------------------------------
Assignee: Daniel
> Retain table aliases after SET, EXTEND, DROP operators
> ------------------------------------------------------
>
> Key: SPARK-50772
> URL: https://issues.apache.org/jira/browse/SPARK-50772
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Daniel
> Assignee: Daniel
> Priority: Major
> Labels: pull-request-available
>
> Per initial feedback from testing, users would like table aliases (such as
> those mapping to left and right side inputs to a prior join) to remain
> available after SET, DROP, and EXTEND operators. Here is an example that
> should work:
>
> {{values (0), (1) lhs(a)}}
> {{|> inner join values (1), (2) rhs(a) using (a)}}
> {{|> extend lhs.a + rhs.a as z1}}
> {{|> extend lhs.a - rhs.a as z2}}
> {{|> drop z1}}
> {{|> where z2 = 0}}
> {{|> order by lhs.a, rhs.a, z2}}
> {{|> set z2 = 4}}
> {{|> limit 2}}
> {{|> select lhs.a, rhs.a, z2;}}
>
> 1 1 4
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