[jira] [Commented] (IGNITE-2177) User defined aggregate functions for SQL

[Sergi Vladykin (JIRA)]

    [ 
https://issues.apache.org/jira/browse/IGNITE-2177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15071887#comment-15071887
 ] 

Sergi Vladykin commented on IGNITE-2177:
----------------------------------------

I think the code should look like the following:

We should have two interfaces:
{code}
interface DistributedSqlAggregate {
     String getMapAlias();
     
     String getReduceAlias();

     String getLocalAlias();
 
    SqlAggregate createMapAggregate();

    SqlAggregate createReduceAggregate();

   SqlAggregate createLocalAggregate();
}

interface SqlAggregate {
// This ineterface have to reflect 
https://github.com/h2database/h2database/blob/master/h2/src/main/org/h2/api/AggregateFunction.java
}

// And method on cache configuration
ccfg.setSqlAggregates(Class... clss);

{code}




> User defined aggregate functions for SQL
> ----------------------------------------
>
>                 Key: IGNITE-2177
>                 URL: https://issues.apache.org/jira/browse/IGNITE-2177
>             Project: Ignite
>          Issue Type: Wish
>            Reporter: Sergi Vladykin
>             Fix For: 1.6
>
>
> Need to design some factory like abstraction for creating map part and reduce 
> part of the aggregate. 



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