[jira] Closed: (IBATISNET-232) Nested left joins with group by cause NPE when two subsequent levels have null values

["Gilles Bayon (JIRA)" <ib...@incubator.apache.org>]

     [ https://issues.apache.org/jira/browse/IBATISNET-232?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles Bayon closed IBATISNET-232.
----------------------------------

       Resolution: Fixed
    Fix Version/s: DataMapper 1.6.2
         Assignee: Gilles Bayon

Patch apply 
Thanks
In SVN

> Nested left joins with group by cause NPE when two subsequent levels have null values
> -------------------------------------------------------------------------------------
>
>                 Key: IBATISNET-232
>                 URL: https://issues.apache.org/jira/browse/IBATISNET-232
>             Project: iBatis for .NET
>          Issue Type: Bug
>          Components: DataMapper
>    Affects Versions: DataMapper 1.6.1
>            Reporter: Spyros Oikonomopoulos
>            Assignee: Gilles Bayon
>             Fix For: DataMapper 1.6.2
>
>         Attachments: DataMapper.MappedStatements.PropertStrategy.GroupByStrategy.patch
>
>
> Region (region_id, name) values: (1, 'reg1') (2, 'reg2')
> State (state_id, region_id, name) values: (1, 1, 'state1')
> City (city_id, region_id, state_id, name) values (1,1,1,'city1')
> A nested group with left joins will create the following rows:
> 1 reg1 --- 1 1 state 1 --- 1 1 1 city1
> 2 reg2 --- null --- null
> Now during construction of the object hierarchy iBatis, for the second row  tries to set the "cities" collection of the state object, which unfortunately is null, so an NPE is raised.

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