How to read only one row from dataset?

[MVL]

Hello

Is there any way to read only 1 row from a dataset? (For testing of a job)
I can use filter stage after DataSet stage but still job is going to read all the rows from dataset.

The problem is that this is a huge input dataset and I want to test my job with just 1 row. Do we have some stage to read only one row from DataSet (Something like Universe stage for hash file...)?

Thanks

[ray.wurlod]

No. That's not how parallel jobs work. They move (large) blocks of data. The Data Set is copied (using a copy operator) into the virtual Data Set associated with the link to which it connects. Yes, you can use a Filter, Switch or Transformer stage to limit what comes off that link, but operators all work only with virtual Data Sets.

[MVL]

Thanks Ray

When we use 'veiw data' option from designer it asks number of rows to be displayed.

If we select 1 then only one row is selected there. (Even there it reads entire block?) Why dont we have same functionality in a form of stage?

Thanks

[ray.wurlod]

You do. Look at the osh generated and executed by View Data. It includes a head operator to limit the rows according to your selection.