Bug 150899 Cannot bind data values to chart series, which causes chart preview fail.
How to reproduce it? 1. Create a new chart, bind it with valid data set. 2. Assign the valid data values to category series and value series. Current result: 1. There is no chart live preview in chart builder. It still uses the default sample data. 2. Preview, dataset invalid exception is thrown out. Investigation: It is perhaps caused by ResultSetWrapper.java. There is no initializeMeta( ) in the Constructor.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/internal/datafeed/ResultSetWrapper.java
}
	/**
	 * Returns the values for given column and compute index arrays.
	 * 
	 * @param iColumnIndex
	 * @return an array have two return objects, first is the base value list,
	 *         second is the index map for all grouped subset.
	 */
	public Object[] getMergedGroupingBaseValues( int iColumnIndex,
			SortOption sorting )
	{
		int groupCount = getGroupCount( );
		final List idxList = new ArrayList( groupCount );
		Object oValue;
		ResultSetDataSet rsd;
		final List baseValue = new ArrayList( );
		List idx;
		for ( int k = 0; k < groupCount; k++ )
		{
			rsd = getSubset( k, iColumnIndex );
			idx = new ArrayList( );
			if ( k == 0 )
			{
				
				int i = 0;
				while ( rsd.hasNext( ) )
				{
					oValue = rsd.next( )[0];
					baseValue.add( oValue );
					idx.add( new Integer( i++ ) );