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https://issues.apache.org/jira/browse/CALCITE-1551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15769288#comment-15769288
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Julian Hyde commented on CALCITE-1551:
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Agreed, {{project}} should preserve table aliases.
> RelBuilder's project() doesn't preserve alias
> ---------------------------------------------
>
> Key: CALCITE-1551
> URL: https://issues.apache.org/jira/browse/CALCITE-1551
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jess Balint
> Assignee: Julian Hyde
> Priority: Minor
>
> The alias should be preserved by the project node, e.g.
> {code:java}
> .scan("EMP")
> .as("EMP_alias")
> .project(...) // resets alias to null
> .project(builder.field("EMP_alias", "DEPTNO")) // fails that no such alias
> exists
> {code}
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