It would be a good functionality to have if we can restrict the rows in the data table via a transformation when we use that as a source.
Lets say I have a DT "A" with 1mil rows and I want to do a separate analysis with certain set of rows - so I currently have to use as source DT -"A" which has like 1mil rows and perform the calculation.
This can be improved by restricting the rows that I want to work on from the current data table
Please use a Data table data source followed by a Row filter data transformation.
This is fairly easy to do with a simple output <- input data function connected to a filtering scheme.
may be including a new transformation called "Filter"