order preservation in data flow

Hi Experts,

                I would like to know whether the order of data flowing through a dataflow is preserved or not.

consider the scenario as follows.

I have a source table

I fetch it to a query transform to set an error flag based on some column values(say if column1 or column2 or column3 is null then error flag is E else null)

Then I have a case statement to split the flow into two based on the error flag value( If Error flag is E then Error else success )

on both the flows i am having one table comparison each before loading it to target tables.

Since i am using sorted input option in table comparison I need the data to be sorted. Should i do it separately using one query transform each before the Table comparisons or can i use an order by in the first Query transform itself. Also If i am using the order by in the first query transform, Will this operation be pushed down to the DB?

Thanks & Regards

Alex Oommen