We have a growing community of DV users utilizing the OAS Data Flow tool to create complex joins across diverse data and performing other manipulations.
One request that comes up constantly is "I'd really like to know how many rows are in the Data Flow at this step of the process". This particularly causes issues when a development data flow is causing performance issues or has missing data. It can be difficult to figure out when in the process there is a bad join between sources or streams, or when a bad filter is dropping more than expected without an easy way to monitor what's going on.
Providing a tool that would allow a data flow to be "run" to a particular step in the process and then information about the current state of the flow, including how many records are currently in the flow at the conclusion of a given step, would be very useful for user troubleshooting of things like Cartesian Joins or missing data location.
Other data flow tools have this sort of functionality, it would be a good add for the Data Flow component.
