Bug 195970 Two issues when evaluate a query inlcuding a subquery[07]
Description: Currently, when evaluating a query which includes a subquery, the query will be evaluated twice. The binding of query will pass to subquery twice. If user write a java script such as new Date() and i++. The result of query will be incorrect. Another issue: when write the report document, the binding of query will be written twice and the performance is not good to evalulate it twice.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/BindingColumnsEvalUtil.java
if ( valueMap.containsKey( bindingColumn.columnName ) )
					continue;
				Object exprValue = evaluateValue( bindingColumn, MANUAL_BINDING );
				valueMap.put( bindingColumn.columnName, exprValue );
			}
		}
		saveHelper.doSaveExpr( valueMap );
	}
	/**
	 * @param baseExpr
	 * @param exprType
	 * @param valueMap
	 * @throws DataException
	 */
	private Object evaluateValue( BindingColumn bindingColumn, int exprType )
			throws DataException
	{
		Object exprValue = null;
		try
		{
			boolean getValue = false;
			if ( isBasedOnRD == true )
			{
				String columnName = bindingColumn.columnName;
				if ( evalHelper.contains( columnName ) )
				{
					getValue = true;
					exprValue = evalHelper.getValue( columnName );
				}
			}