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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 updated FLINK-1444:
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Description:
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.
was:
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.
> 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
> 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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