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From "Fabian Hueske (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-1776) APIs provide invalid Semantic Properties for Operators with SelectorFunction keys
Date Mon, 23 Mar 2015 16:54:11 GMT
Fabian Hueske created FLINK-1776:
------------------------------------

             Summary: APIs provide invalid Semantic Properties for Operators with SelectorFunction
keys
                 Key: FLINK-1776
                 URL: https://issues.apache.org/jira/browse/FLINK-1776
             Project: Flink
          Issue Type: Bug
          Components: Java API, Scala API
    Affects Versions: 0.9
            Reporter: Fabian Hueske
            Assignee: Fabian Hueske
            Priority: Critical
             Fix For: 0.9


Semantic properties are defined by users and evaluated by the optimizer.
When semantic properties such as forwarded or read fields are bound to the input type of a
function.
In case of operators with selector function keys, a user function is wrapped by a wrapping
function that has a different input types than the original user function. However, the user-defined
semantic properties are verbatim forwarded to the optimizer. 
Since the properties refer to a specific type which is changed by the wrapping function and
the semantic properties are not adapted, the optimizer uses wrong properties and might produce
invalid plans



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