You could probably do that using the IF_FDT_FACTORY-->GET_EXPRESSION method. You will however need to pass the decision table GUID. Once you get the object back, you can cast it into IF_FDT_DECISION_TABLE and the use the different methods.
However, I'm wondering why would you want to do that, especially that it seems that you want to build a report off of it? If so, you should just build a BRF+ function that reads from that table. Your report should call the BRF+ function. As for parameters, you can either use the data elements used for the BRF+ table or create your own. Once a user enters selection data, pass those to the BRF+ function and display the results you get back. The BRF+ tool can actually build a function module from the BRF+ function which will make it extremely easy.
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