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
value );
				}
				else
				{
					throw new DataException( ResourceConstants.EXPR_INVALID_COMPUTED_COLUMN,
							resultObject.getResultClass( )
									.getFieldName( columnIndexArray[i] ) );
				}
			}
		}
		finally
		{
			Context.exit( );
		}
		logger.exiting( ComputedColumnHelper.class.getName( ), "process" );
		return true;
	}
	/**
	 * Indicate the ComputedColumnHelper to reprepare.
	 * 
	 * @param rePrepare
	 */
	public void setRePrepare( boolean rePrepare )
	{
		this.isPrepared = !rePrepare;
	}
	/*
	 * Convert ccList to projComputedColumns, only prepare once.
	 */
	private void prepare( IResultClass resultClass ) throws DataException