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https://issues.apache.org/jira/browse/CALCITE-6324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17826853#comment-17826853
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Mihai Budiu commented on CALCITE-6324:
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Upon further reflection I think that leaving the types as they are is simplest.
Since the compiler cannot infer a safe bound, it should leave this to the user,
who may know something about the data.
So we take the Oracle approach, the existing implementation.
I will close this issue.
> Type inferred for result of STDDEV, VAR_SAMP, etc. is incorrect
> ---------------------------------------------------------------
>
> Key: CALCITE-6324
> URL: https://issues.apache.org/jira/browse/CALCITE-6324
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.36.0
> Reporter: Mihai Budiu
> Assignee: Mihai Budiu
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.37.0
>
>
> These functions are all use the same type inference algorithm, essentially
> the algorithm used by AVG.
> But if the values processed are decimal, STDDEV (and others) need much higher
> precision to represent the result. (I am not sure that the inference is right
> for integer types either, btw.)
> This surfaced during the implementation of a fix for [CALCITE-6322]: if we
> use the type inferred for these functions, the result overflows and causes a
> runtime exception.
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