[jira] [Assigned] (KUDU-1312) expose API for partition-aware scan descriptors

["Dan Burkert (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KUDU-1312?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dan Burkert reassigned KUDU-1312:
---------------------------------

    Assignee: Dan Burkert

> expose API for partition-aware scan descriptors
> -----------------------------------------------
>
>                 Key: KUDU-1312
>                 URL: https://issues.apache.org/jira/browse/KUDU-1312
>             Project: Kudu
>          Issue Type: Sub-task
>          Components: client
>            Reporter: Dan Burkert
>            Assignee: Dan Burkert
>
> Most integrations working with Kudu will eventually need to access partition information when scanning so that data locality can be preserved.
> We should provide an API which takes scan parameters (start/stop primary key and predicates) and returns a set of scan descriptors, each of which is associated with a data location.  Partition pruning should be built in to this API so that each integration does not have to reinvent that particular wheel.
> The API should also allow a descriptor to be split into further pieces, so that higher-level integrations can increase parallelism without client-side filtering.
> Finally, the descriptors should be serializable so that they can be passed between the C++ and Java clients (mostly to allow Impala to construct the query plan in Java and execute it in C++).



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