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https://issues.apache.org/jira/browse/IGNITE-14681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17422665#comment-17422665
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Taras Ledkov commented on IGNITE-14681:
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Pardon for the long answer. I was on vacation.
[~alex_pl], the {{test_sum.test}} is fixed, please take a look.
> Calcite engine. Extend return type of sum() aggregate function
> --------------------------------------------------------------
>
> Key: IGNITE-14681
> URL: https://issues.apache.org/jira/browse/IGNITE-14681
> Project: Ignite
> Issue Type: Bug
> Reporter: Aleksey Plekhanov
> Assignee: Taras Ledkov
> Priority: Major
> Labels: calcite2-required, calcite3-required
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> Currently, {{sum()}} aggregate function returns the same type as an argument
> and there can be an overflow.
> For example, query:
> {noformat}
> SELECT SUM(i::SMALLINT) FROM (SELECT 32000 as i UNION ALL SELECT
> 32000){noformat}
> Returns {{-1536}}.
> or
> {noformat}
> CREATE TABLE integers(i INTEGER);
> INSERT INTO integers SELECT * FROM table(system_range(0, 999, 1));
> SELECT SUM(b) FROM bigints
> {noformat}
> Returns {{499500}} instead of {{4611686018427388403500}}.
> Perhaps it would be better to return an extended type as some other vendors
> do.
> For example, PostgreSQL returns {{bigint}} for {{smallint}} or {{int}}
> arguments, {{numeric}} for {{bigint}} arguments, {{double precision}} for
> floating-point arguments. MySQL returns a {{DECIMAL}} value for exact-value
> arguments ({{INTEGER}} or {{DECIMAL}}), and a {{DOUBLE}} value for
> approximate-value arguments ({{FLOAT}} or {{DOUBLE}})
> Affected tests:
> {{modules/calcite/src/test/sql/aggregate/aggregates/test_sum.test_ignore}}
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