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https://issues.apache.org/jira/browse/SYSTEMML-525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15150124#comment-15150124
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Matthias Boehm commented on SYSTEMML-525:
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The issue is missing constant propagation on read io filenames.
> Treat variable of const str concatenations as const str in read iofilename
> --------------------------------------------------------------------------
>
> Key: SYSTEMML-525
> URL: https://issues.apache.org/jira/browse/SYSTEMML-525
> Project: SystemML
> Issue Type: Improvement
> Components: Parser
> Reporter: Deron Eriksson
> Assignee: Matthias Boehm
> Priority: Minor
>
> If a string variable value is the result of constant string concatentations,
> perhaps it should be treated as a constant string since this can be
> determined at compile time.
> {code}
> # works
> x = "m";
> y = ".csv";
> b = read(x + y);
> # doesn't work
> z = "m" + ".csv";
> b = read(z);
> {code}
> The second read statement above generates the following error:
> {code}
> for read method, parameter iofilename can only be a const string or const
> string concatenations
> {code}
> Since the z value results from the concatenation of 2 string constants, I
> would think it could be treated as a string constant itself.
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