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https://issues.apache.org/jira/browse/CALCITE-6343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17831110#comment-17831110
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Julian Hyde edited comment on CALCITE-6343 at 9/16/24 1:55 AM:
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I edited the description, removing the explicit link. Note that CALCITE-5869
now has strike-through, because the bug is closed.
It seems reasonable that "{{SELECT m AS m}}" should return a measure if {{m}}
is a measure. But we also need a gesture to convert m into a value; any
suggestions what that should be? Also, can we agree that "{{SELECT * FROM t}}"
is equivalent to writing "{{SELECT m, n, o, p FROM t}}", with each of the
columns remaining measures (or non-measures).
Is this behavior documented anywhere?
was (Author: julianhyde):
I edited the description, removing the explicit link. Note that CALCITE-5689
now has strike-through, because the bug is closed.
It seems reasonable that "{{SELECT m AS m}}" should return a measure if {{m}}
is a measure. But we also need a gesture to convert m into a value; any
suggestions what that should be? Also, can we agree that "{{SELECT * FROM t}}"
is equivalent to writing "{{SELECT m, n, o, p FROM t}}", with each of the
columns remaining measures (or non-measures).
Is this behavior documented anywhere?
> 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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