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

[Dan Washusen (JIRA)]

[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


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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