Issue: A week back, I had written a post on how we used the gen_row_num_by_group function create a sequence of numbers based on a particular column in BODS. I ran into an issue sometime later, where the sequences were not getting properly generated.
Cause: This is because the input source was not properly sorted. When you use this particular function based on a column, you should note that the input to the query transform should be properly sorted first. This is very important, if you miss this then the data will not be properly sorted and hence create wrong sequence numbers.
Resolution: The way to resolve this issue is to have your input data sorted. For example, if you are creating a sequence based on ClassId column as below,
gen_row_num_by_group(ClassId)
You should in this case make sure that the data coming to the query transform be grouped on this particular column, i.e ClassId in this example. This makes sure the sequence gets generated accordingly.
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