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/ResultIterator.java
{
				this.bindingColumnsEvalUtil = new BindingColumnsEvalUtil( this.odiResult,
						this.scope,
						this.getRdSaveHelper( ),
						this.resultService.getAllBindingExprs( ),
						this.resultService.getAllAutoBindingExprs( ) );
			}
			
			bindingColumnsEvalUtil.getColumnsValue( boundColumnValueMap );
			
			if ( needCache() )
			{
				try 
				{
					saveCurrentRow( );
				} 
				catch (IOException e) 
				{
					throw new DataException( ResourceConstants.WRITE_CACHE_TEMPFILE_ERROR );
				} 
				catch (BirtException e) 
				{
					throw DataException.wrap(e);
				}
			}
			
			this.isFirstRowPepared = false;
		}
		
	}