[jira] [Resolved] (SYSTEMML-1357) Fix value type promotion semantics of all scalar-scalar operations

["Matthias Boehm (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SYSTEMML-1357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Matthias Boehm resolved SYSTEMML-1357.
--------------------------------------
       Resolution: Fixed
         Assignee: Matthias Boehm
    Fix Version/s: SystemML 1.0

> Fix value type promotion semantics of all scalar-scalar operations
> ------------------------------------------------------------------
>
>                 Key: SYSTEMML-1357
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1357
>             Project: SystemML
>          Issue Type: Bug
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> Right now our value type promotion semantics are inconsistent across matrices and scalars and across different types of binary scalar-scalar operations (relational, arithmetic, builtin). This task aims to fix this and establish the following value type promotion semantics:
> * if any input type is string, both inputs are interpreted as strings
> * else if any input type is double, both inputs are interpreted as doubles 
> * else if any input type is long, both inputs are interpreted as long
> * else if any input type is boolean, both inputs are interpreted as boolean
> Furthermore, (1) boolean-strings casts are handled in a language-dpendent manner (for concatenation with +), and (2) boolean true/false is interpreted as 1/0 double/long (consistent with matrix relational operations).
> Beside consistent semantics, this change also allows us to cleanup all value functions, which unnecessarily implement, for example, combinations of double-long which internally apply these promotion rules.



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