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From: "Jonathan Hsieh (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-9359) Convert KeyValue to Cell in
 hbase-client module - Result/Put/Delete, ColumnInterpreter
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    [ https://issues.apache.org/jira/browse/HBASE-9359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762461#comment-13762461 ] 

Jonathan Hsieh commented on HBASE-9359:
---------------------------------------

The secret cast method exists -- it is KeyValueUtil.ensureKeyValue(Cell).  The problem has to do with generic aggregate types with a type parameter.  

For example this code in in invalid:

{code}
List<Cell> foo == ...;
List<KeyValue> bar = foo; // compile time fail.
{code}

Essentially the inefficiency come with a copy necessary for doing this.
{code}
List<Cell> foo == ...; 
List<KeyValue> bar = foo; // no good.  see [1]
{code}

[1] https://issues.apache.org/jira/browse/HBASE-9359?focusedCommentId=13752906&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13752906


                
> Convert KeyValue to Cell in hbase-client module - Result/Put/Delete, ColumnInterpreter
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-9359
>                 URL: https://issues.apache.org/jira/browse/HBASE-9359
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client
>    Affects Versions: 0.95.2
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>             Fix For: 0.98.0, 0.96.0
>
>         Attachments: hbase-9334-9359.v4.patch, hbase-9359-9334.v5.patch, hbase-9359-9334.v6.patch, hbase-9359.patch, hbase-9359.v2.patch, hbase-9359.v3.patch, hbase-9359.v5.patch, hbase-9359.v6.patch
>
>
> This path is the second half of eliminating KeyValue from the client interfaces.  This percolated through quite a bit. 

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