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https://issues.apache.org/jira/browse/CALCITE-1945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16128197#comment-16128197
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MinJi Kim commented on CALCITE-1945:
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I have a first draft of this patch here. I would like to make sure that this
is a proper approach. Since we always expand AVG/VAR/STDDEV functions, so I am
adding casts before we dividing the numerator and denominator. Let me know if
it should be done in another way. Thanks!
https://github.com/apache/calcite/pull/518
> Allow custom return types for AVG/VARIANCE/STDDEV/COVAR
> -------------------------------------------------------
>
> Key: CALCITE-1945
> URL: https://issues.apache.org/jira/browse/CALCITE-1945
> Project: Calcite
> Issue Type: Bug
> Reporter: MinJi Kim
> Assignee: Julian Hyde
>
> For example, return types of AVG() is the input type. So, if the input is
> INT/BIGINT type, AVG() is always truncated. Depending on the database, some
> database follow this behavior while others (e.g. Oracle/MySQL/etc.) do not
> and return floating point values for AVG().
> Similar for other functions mentioned here.
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