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https://issues.apache.org/jira/browse/SYSTEMML-2077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373367#comment-16373367
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Matthias Boehm commented on SYSTEMML-2077:
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thanks for your interest [~Guobao] - I updated the description to provide some
more details. This task can indeed lay some foundations for SYSTEMML-2083
because both would deal with second-order functions (that take functions as
arguments).
> New eval builtin function
> -------------------------
>
> Key: SYSTEMML-2077
> URL: https://issues.apache.org/jira/browse/SYSTEMML-2077
> Project: SystemML
> Issue Type: Sub-task
> Reporter: Matthias Boehm
> Priority: Major
>
> This new eval builtin function aims to provide a concise language construct
> to evaluate dynamic expressions and functions.
> Similar to R's eval function
> (https://stat.ethz.ch/R-manual/R-devel/library/base/html/eval.html), this
> would allow us to evaluate dynamically constructed expressions. There are two
> major sub tasks here: the invocation of given function pointers and the
> evaluation of dynamic expressions given as strings. Initially, we would focus
> on the former by allowing call such as {{R = eval(fname, A, B, C)}}. So far
> SystemML does not provide second-order functions which requires explicit
> {{if-else}} conditions for ensemble learning workloads. With this new
> {{eval}} function we could store a list of function names in a frame {{F}}
> and dynamically call them via {{R[i, ] = eval(F[i,1], A, B, C)}}.
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