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https://issues.apache.org/jira/browse/CALCITE-6070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17779463#comment-17779463
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LakeShen commented on CALCITE-6070:
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I think that the alias 'DID' should be keeped after the RelFieldTrimmer.
I test the similar sql in presto,the alias is keeped.So it maybe a bug.
> Incorrect field name after RelFieldTrimmer
> ------------------------------------------
>
> Key: CALCITE-6070
> URL: https://issues.apache.org/jira/browse/CALCITE-6070
> Project: Calcite
> Issue Type: Wish
> Components: core
> Affects Versions: 1.35.0
> Reporter: ZheHu
> Priority: Minor
>
> Run the following SQL in SqlToRelConverterTest:
> {code}
> select ename as did from emp where ename='a' limit 10
> {code}
> Got planA without RelFieldTrimmer:
> {code}
> LogicalSort(fetch=[10])
> LogicalProject(DID=[$1])
> LogicalFilter(condition=[=($1, 'a')])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> Got planB with RelFieldTrimmer:
> {code}
> LogicalSort(fetch=[10])
> LogicalFilter(condition=[=($0, 'a')])
> LogicalProject(ENAME=[$1])
> LogicalTableScan(table=[[CATALOG, SALES, EMP]])
> {code}
> However, the column alia DID for ENAME is missing in planB.
> Maybe we can do something about the trimmer when we have other
> purposes(renaming column is the only purpose for this case).
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