groupby and null values

[Zsolt]

Hi,

I use "groupBy" in resultMap and because I use LEFT OUTTER JOIN-s I get also
NULL values into the list associated to the result property ("categories").

Because ArrayList is created by ibatis, how can I eliminate the null values?
I have several List-s, thus I don't want to do that for all list manually.

<resultMap ... groupBy="id">
...
        <result property="categories" resultMap="Cltr.categoriesResult"/>
  </resultMap>

Zsolt