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https://issues.apache.org/jira/browse/CALCITE-1945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143253#comment-16143253
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MinJi Kim commented on CALCITE-1945:
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Thank you for the review, [~julianhyde]! I am sorry for the delay in getting
back with an updated patch. I am still traveling, but now do have some time to
get back to this. I have updated the PR, and addressed the comments you gave.
RexBuilder.ensureType() really do make the code nicer. Thanks for the pointer!
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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