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https://issues.apache.org/jira/browse/CALCITE-6839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17928557#comment-17928557
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Mihai Budiu commented on CALCITE-6839:
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In fact, the type system *does* include methods to derive various aggregate
types.
They are deriveSumType, deriveAvgAggType, etc.
So the solution is to plug a different type system.
> 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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