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 ( getValue == false )
			{
				if ( exprType == MANUAL_BINDING )
				{	
					if ( bindingColumn.isAggregation )
						exprValue = this.odiResult.getAggrValue( bindingColumn.columnName );
					else
						exprValue = ExprEvaluateUtil.evaluateExpression( bindingColumn.baseExpr,
							odiResult,
							scope );
				}
				else
					exprValue = ExprEvaluateUtil.evaluateRawExpression( bindingColumn.baseExpr,
							scope );
				
				if ( exprValue!= null )
					exprValue = DataTypeUtil.convert( JavascriptEvalUtil.convertJavascriptValue( exprValue ), bindingColumn.type );
			}
		}
		catch ( BirtException e )
		{
			exprValue = e;
		}
		
		return exprValue;
	}
	
	/**
	 * Evaluate the specified binding column in MANUAL_BINDING mode.