Bug 123036 Data in a reprot is doubly stored
We currently stored data twice. Once in the content stream, once by DtE. The instance stored by content stream should not be there.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
*/
	public Double getDouble( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toDouble( getValue( dataExpr ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getString(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public String getString( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toString( getValue( dataExpr ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBigDecimal(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public BigDecimal getBigDecimal( IBaseExpression dataExpr )
			throws BirtException
	{
		return DataTypeUtil.toBigDecimal( getValue( dataExpr ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getDate(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */
	public Date getDate( IBaseExpression dataExpr ) throws BirtException
	{
		return DataTypeUtil.toDate( getValue( dataExpr ) );
	}
	/*
	 * @see org.eclipse.birt.data.engine.api.IResultIterator#getBlob(org.eclipse.birt.data.engine.api.IBaseExpression)
	 */