[jira] Commented: (HBASE-2239) [IHBase] Improve the expression classes by adding the ability to generate filters from them.

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

    [ https://issues.apache.org/jira/browse/HBASE-2239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855023#action_12855023 ] 

stack commented on HBASE-2239:
------------------------------

Transitory errors have been seen in tests.  Check again after 2248 goes in.

> [IHBase] Improve the expression classes by adding the ability to generate filters from them.
> --------------------------------------------------------------------------------------------
>
>                 Key: HBASE-2239
>                 URL: https://issues.apache.org/jira/browse/HBASE-2239
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: contrib
>    Affects Versions: 0.20.3
>            Reporter: Dan Washusen
>             Fix For: 0.20.4
>
>         Attachments: HBASE-2239.patch
>
>
> One of the requirements of IHBase is that the a filter should be provided that at least matches the index expression hint.  The IHBase expression classes could easily be used to generate a filter that can be used on the scan...
> For example: 
> {code}
> Expression expression = Expression
>     .or(
>         Expression.comparison(columnName1, qualifer1, operator1, value1)
>     )
>     .or(
>         Expression.and()
>             .and(Expression.comparison(columnName2, qualifer2, operator2, value2))
>             .and(Expression.comparison(columnName3, qualifer3, operator3, value3))
>     );
> Filter filter  = expression.toFilter();
> {code}

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