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https://issues.apache.org/jira/browse/CALCITE-545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-545.
---------------------------------
Resolution: Fixed
Fix Version/s: 1.0.0-incubating
Fixed in
http://git-wip-us.apache.org/repos/asf/incubator-calcite/commit/c9e58edf.
> When a projected expression can only have one value, replace with that
> constant
> -------------------------------------------------------------------------------
>
> Key: CALCITE-545
> URL: https://issues.apache.org/jira/browse/CALCITE-545
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Fix For: 1.0.0-incubating
>
>
> When we have deduced that an expression can only have one value, replace the
> expression with that value. This is beneficial because it will allow us to do
> more column trimming.
> Example 1
> {code}select deptno from emp where deptno = 10{code}
> can become
> {code}select 10 from emp where deptno = 10{code}
> Example 2 (using inference, as in CALCITE-360)
> {code}select emp.deptno
> from emp join dept using (deptno)
> where dept.deptno = 10{code}
> can become
> {code}select 10
> from emp join dept using (deptno)
> where dept.deptno = 10{code}
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