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https://issues.apache.org/jira/browse/FLINK-1319?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14379764#comment-14379764
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Timo Walther commented on FLINK-1319:
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Is there a reason why Semantic Properties are not available in the Scala API?
Does it make sense to also move it to core / org.apache.flink.api.common?
> Add static code analysis for UDFs
> ---------------------------------
>
> Key: FLINK-1319
> URL: https://issues.apache.org/jira/browse/FLINK-1319
> Project: Flink
> Issue Type: New Feature
> Components: Java API, Scala API
> Reporter: Stephan Ewen
> Assignee: Timo Walther
> Priority: Minor
>
> Flink's Optimizer takes information that tells it for UDFs which fields of
> the input elements are accessed, modified, or frwarded/copied. This
> information frequently helps to reuse partitionings, sorts, etc. It may speed
> up programs significantly, as it can frequently eliminate sorts and shuffles,
> which are costly.
> Right now, users can add lightweight annotations to UDFs to provide this
> information (such as adding {{@ConstandFields("0->3, 1, 2->1")}}.
> We worked with static code analysis of UDFs before, to determine this
> information automatically. This is an incredible feature, as it "magically"
> makes programs faster.
> For record-at-a-time operations (Map, Reduce, FlatMap, Join, Cross), this
> works surprisingly well in many cases. We used the "Soot" toolkit for the
> static code analysis. Unfortunately, Soot is LGPL licensed and thus we did
> not include any of the code so far.
> I propose to add this functionality to Flink, in the form of a drop-in
> addition, to work around the LGPL incompatibility with ALS 2.0. Users could
> simply download a special "flink-code-analysis.jar" and drop it into the
> "lib" folder to enable this functionality. We may even add a script to
> "tools" that downloads that library automatically into the lib folder. This
> should be legally fine, since we do not redistribute LGPL code and only
> dynamically link it (the incompatibility with ASL 2.0 is mainly in the
> patentability, if I remember correctly).
> Prior work on this has been done by [~aljoscha] and [~skunert], which could
> provide a code base to start with.
> *Appendix*
> Hompage to Soot static analysis toolkit: http://www.sable.mcgill.ca/soot/
> Papers on static analysis and for optimization:
> http://stratosphere.eu/assets/papers/EnablingOperatorReorderingSCA_12.pdf and
> http://stratosphere.eu/assets/papers/openingTheBlackBoxes_12.pdf
> Quick introduction to the Optimizer:
> http://stratosphere.eu/assets/papers/2014-VLDBJ_Stratosphere_Overview.pdf
> (Section 6)
> Optimizer for Iterations:
> http://stratosphere.eu/assets/papers/spinningFastIterativeDataFlows_12.pdf
> (Sections 4.3 and 5.3)
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