Bug 153507 Bogus error when bad data set column referenced in group key
Run attached report design. Its group key binding column, "groupkey", is defined to refer to a non-existing data set column: dataSetRow["bad"]. However the actual error seen when previewing the report in BIRT designer: Table (id = 6): + A BIRT exception occurred: Error evaluating Javascript expression. Script engine error: TypeError: valueOf is not a function. Script source: null, line: 0, text: <compiled script>. See next exception for more information. Error evaluating Javascript expression. Script engine error: TypeError: valueOf is not a function. Script source: null, line: 0, text: <compiled script> This error is completely irrelevant to the actual cause of the problem.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ComputedColumnHelper.java
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.
	 * 
	 * @return
	 */
	public List getComputedColumnList( )
	{
		if ( this.getCurrentInstance( ) != null )
			return this.getCurrentInstance( ).getComputedColumnList( );
		else
			return this.allCC;
	}