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https://issues.apache.org/jira/browse/FLINK-10438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Piotr Nowojski updated FLINK-10438:
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Description:
As it is now, user have no idea to know whether the result of the operation is
accurate or not.
For example {{POWER(4, 2)}} or {{POWER(2.5, )}} could return exact results
(with proper {{DECIMAL}} support), while it seems like now they are silently
returning approximated result (because of {{DOUBLE}} arithmetic). Same applies
to other arithmetic functions, like {{COS SIN ATAN LOG ...}}.
Such behaviour should be documented. In some cases documenting the argument
types also might be important.
was:
As it is now, user have no idea to know whether the result of the operation is
accurate or not.
For example {{POWER(4, 2)}} or {{POWER(2.5, )}} could return exact results
(with proper {{DECIMAL}} support), while it seems like now they are returning
approximated result (because of {{DOUBLE}} arithmetic). Same applies to other
arithmetic functions, like {{COS SIN ATAN LOG ...}}.
Such behaviour should be documented. In some cases documenting the argument
types also might be important.
> Built in functions should document the returned types
> -----------------------------------------------------
>
> Key: FLINK-10438
> URL: https://issues.apache.org/jira/browse/FLINK-10438
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.6.1
> Reporter: Piotr Nowojski
> Priority: Major
>
> As it is now, user have no idea to know whether the result of the operation
> is accurate or not.
> For example {{POWER(4, 2)}} or {{POWER(2.5, )}} could return exact results
> (with proper {{DECIMAL}} support), while it seems like now they are silently
> returning approximated result (because of {{DOUBLE}} arithmetic). Same
> applies to other arithmetic functions, like {{COS SIN ATAN LOG ...}}.
> Such behaviour should be documented. In some cases documenting the argument
> types also might be important.
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