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https://issues.apache.org/jira/browse/FLINK-21125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-21125:
-----------------------------------
Labels: stale-major (was: )
I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help
the community manage its development. I see this issues has been marked as
Major but is unassigned and neither itself nor its Sub-Tasks have been updated
for 30 days. I have gone ahead and added a "stale-major" to the issue". If this
ticket is a Major, please either assign yourself or give an update. Afterwards,
please remove the label or in 7 days the issue will be deprioritized.
> Sum or Sum0 overflow quietly
> ----------------------------
>
> Key: FLINK-21125
> URL: https://issues.apache.org/jira/browse/FLINK-21125
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Reporter: Sebastian Liu
> Priority: Major
> Labels: stale-major
> Fix For: 1.14.0
>
>
> Overflow is not calculated correctly in the build-in sum function of Blink
> planner.
> For a aggregate calculation such as:
> {code:java}
> CREATE TABLE TestTable (
> amount INT
> );
> insert into TestTable (2147483647);
> insert into TestTable (1);
> SELECT sum(amount) FROM TestTable;
> The result will be: -2147483648, which is an overflowed value and no
> exception was thrown. {code}
> The overflow occurs quietly and is difficult to detect.
> Compare the processing semantics of other systems：
> * *mysql*: provide two SQL mode for handling overflow. If strict SQL mode is
> enabled, MySQL rejects the out-of-range value with an error, and the insert
> fails, in accordance with the SQL standard. If no restrictive modes are
> enabled, MySQL clips the value to the appropriate endpoint of the column data
> type range and stores the resulting value instead. FYI:
> [https://dev.mysql.com/doc/refman/8.0/en/out-of-range-and-overflow.html]
> * *presto*: all numeric types are automatically cast to Long type, and If
> the long is out of range, an exception is thrown to prompt user.
> IMO, exception hint is necessary, instead of quietly overflow.
>
>
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