Bug 187445 The joint result of script computed column is incorrect[07]
Description: 1, Each dataset including a computed column: name: index; type:integer; expression:0 2, Specify the script of datasets to: beforeOpen: index=0; onFetch: row["index"] = index; index++; 3, Join the two datasets Build number: 2.2.0.v20070516-0630 Steps to reproduce: 1, open the attached report design 2, open the joint dataset and preview Actual result: The result of column Data "Set1::index" is all 0 but no value 1.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ComputedColumnHelper.java
* @see org.eclipse.birt.data.engine.odi.IResultObjectEvent#process(org.eclipse.birt.data.engine.odi.IResultObject,
	 *      int)
	 */
	public boolean process( IResultObject resultObject, int rowIndex )
			throws DataException
	{
		if ( this.getCurrentInstance( ) != null )
			return this.getCurrentInstance( ).process( resultObject, rowIndex );
		else
			return true;
	}
	/**
	 * Return whether the computed column set with given model exists
	 * 
	 * @param model
	 * @return
	 */
	public boolean isComputedColumnExist( int model )
	{
		if ( model == TransformationConstants.DATA_SET_MODEL )
			return this.dataSetInstance.getComputedColumnList( ).size( ) > 0;
		else if ( model == TransformationConstants.RESULT_SET_MODEL )
			return this.resultSetInstance.getComputedColumnList( ).size( ) > 0;
		else if ( model == TransformationConstants.ALL_MODEL )
			return this.allCC.size( ) > 0;
		return false;
	}
	/**
	 * Return a list of computed column of current instance.
	 *