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https://issues.apache.org/jira/browse/CALCITE-6343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17882202#comment-17882202
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Julian Hyde commented on CALCITE-6343:
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Reviewing now. It seems that my revised fix of CALCITE-5689 (commit
[bb94122f|https://github.com/apache/calcite/commit/bb94122fa43df86a2ef57fa375e3dc7792666eac])
dealt with this. I'm going to merge the PR, which adds test cases.
> AS alias operator strips MEASUREness from measures
> --------------------------------------------------
>
> Key: CALCITE-6343
> URL: https://issues.apache.org/jira/browse/CALCITE-6343
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.36.0
> Reporter: Barry Kelly
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.38.0
>
>
> CALCITE-5869 introduced a change which removes MEASURE when inferring the
> return type when an operator is applied.
> The {{AS}} keyword for aliases is implemented as an operator in the SQL AST.
> Using {{AS}} removes MEASURE when typing expressions that have an alias in
> the {{SELECT}} clause.
> Thus, the type of {{SELECT m}} and {{SELECT m AS m}} are different when {{m}}
> is a measure. This is not desirable.
> Proposed fix: don't change type when using the {{AS}} operator.
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