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https://issues.apache.org/jira/browse/SYSTEMML-2537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raymond Tay closed SYSTEMML-2537.
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Fix Version/s: Not Applicable
Resolution: Not A Problem
Mathias explained its expected behaviour of the R-like language in SystemML to
exhibit this behavior.
> Improve the consistency of predicates in "If-then-else" expressions
> -------------------------------------------------------------------
>
> Key: SYSTEMML-2537
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2537
> Project: SystemML
> Issue Type: Task
> Components: Parser
> Affects Versions: SystemML 0.13
> Reporter: Raymond Tay
> Priority: Major
> Fix For: Not Applicable
>
> Original Estimate: 48h
> Time Spent: 50m
> Remaining Estimate: 47h 10m
>
> The predicate or conditional-expression in the evaluation of the
> +If-expression+ allows literal numeral values to be part of the predicate. In
> the parser, if it sees a literal value of *1* then it would be _true_
> otherwise it is _false_; however it is entirely plausible to extend that
> definition to cover all values *> 0* to be _true_ otherwise values *< 0* will
> be interpreted as _false_.
> E.g. this should print *No!* but instead it prints "Yes!"
> bq. scala> val s = dml(""" if(-42) print("Yes!") else print("No!") """)
> bq. scala> ml.execute(s)
> bq. Yes!
> bq. SystemML Statistics:
> bq. Total execution time: 0.012 sec.
> bq. Number of executed Spark inst: 0.
> bq.
> bq. res0: org.apache.sysml.api.mlcontext.MLResults = None
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