[jira] [Commented] (CALCITE-5604) Avg function should infer correct data type

["Shuo Cheng (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-5604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17703639#comment-17703639 ] 

Shuo Cheng commented on CALCITE-5604:
-------------------------------------

Hi [~loganzheng], As Ansi SQL 2011 declared, the current behavior is correct.
{noformat}
If AVG is specified and DT is exact numeric, then the declared type of the result is an implementation-defined exact numeric type with precision not less than the precision of DT and scale
not less than the scale of DT.{noformat}
You can explain more specifically why do you think the return type inferred for AVG should be float.

> Avg function should infer correct data type
> -------------------------------------------
>
>                 Key: CALCITE-5604
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5604
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>            Reporter: logan.zheng
>            Priority: Minor
>              Labels: patch
>
> Currently,when the avg input is int type,the return type is int type, but the correct type is float
> RelDataTypeSystemImpl
> {code:java}
> // code placeholder
> @Override public RelDataType deriveAvgAggType(RelDataTypeFactory typeFactory,
>     RelDataType argumentType) {
>   return argumentType;
> } {code}



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