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https://issues.apache.org/jira/browse/SYSTEMML-1357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Glenn Weidner updated SYSTEMML-1357:
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Fix Version/s: (was: SystemML 1.0)
SystemML 0.14
> 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 0.14
>
>
> 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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