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https://issues.apache.org/jira/browse/FLINK-1444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske resolved FLINK-1444.
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Resolution: Implemented
Implemented with f0a28bf5345084a0a43df16021e60078e322e087
> Add data properties for data sources
> ------------------------------------
>
> Key: FLINK-1444
> URL: https://issues.apache.org/jira/browse/FLINK-1444
> Project: Flink
> Issue Type: New Feature
> Components: Java API, JobManager, Optimizer
> Affects Versions: 0.9
> Reporter: Fabian Hueske
> Assignee: Fabian Hueske
> Priority: Minor
>
> This issue proposes to add support for attaching data properties to data
> sources. These data properties are defined with respect to input splits.
> Possible properties are:
> - partitioning across splits: all elements of the same key (combination) are
> contained in one split
> - sorting / grouping with splits: elements are sorted or grouped on certain
> keys within a split
> - key uniqueness: a certain key (combination) is unique for all elements of
> the data source. This property is not defined wrt. input splits.
> The optimizer can leverage this information to generate more efficient
> execution plans.
> The InputFormat will be responsible to generate input splits such that the
> promised data properties are actually in place. Otherwise, the program will
> produce invalid results.
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