[jira] [Created] (HBASE-18747) Introduce new example and helper classes to tell CP users how to do filtering on scanners

["Duo Zhang (JIRA)" <ji...@apache.org>]

Duo Zhang created HBASE-18747:
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             Summary: Introduce new example and helper classes to tell CP users how to do filtering on scanners
                 Key: HBASE-18747
                 URL: https://issues.apache.org/jira/browse/HBASE-18747
             Project: HBase
          Issue Type: Sub-task
          Components: Coprocessors
            Reporter: Duo Zhang


Finally we decided that CP users should not have the ability to create {{StoreScanner}} or {{StoreFileScanner}}, so it is impossible for them to filter out some cells when flush or compaction by simply provide a filter when constructing {{StoreScanner}}.

But I think filtering out some cells is a very important usage for CP users, so we need to provide the ability in another way. Theoretically it can be done with wrapping an {{InternalScanner}}, but I think we need to give an example, or even some helper classes to help CP users.



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