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https://issues.apache.org/jira/browse/CALCITE-6839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928606#comment-17928606
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xiong duan commented on CALCITE-6839:
-------------------------------------
Methods such as deriveSumType, deriveAvgAggType, etc., were introduced in
CALCITE-1945. I initially intended to improve this default rule, but as you
pointed out, there are different standards. Therefore, I will add a new one,
such as Spark's type system. This has become a reference, but I feel it might
not be significant.
In any case, we can always add CAST to solve this problem, for example,
{code:java}
SUM(CAST(EMP AS BIGINT)){code}
> The SUM function sometimes throws overflow exceptions due to incorrect return
> types
> -----------------------------------------------------------------------------------
>
> Key: CALCITE-6839
> URL: https://issues.apache.org/jira/browse/CALCITE-6839
> Project: Calcite
> Issue Type: Bug
> Reporter: xiong duan
> Assignee: xiong duan
> Priority: Major
> Labels: pull-request-available
>
> The SQL in dummy.iq:
> {code:java}
> !use scott
> !set outputformat mysql
> select sum(mgr) from emp;
> !ok{code}
> Because the data type of MGR is TINYINT, according to SUM's data type
> inference rules, the data type of SUM is also TINYINT.
> This SQL throws the exception:
> {code:java}
> java.sql.SQLException: Error while executing SQL "select sum(mgr) from emp":
> Value 38835 out of range {code}
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