Record Combiner merges two or more records from multiple streams into a single record based on a commonality. Record Combiner can have one or more stage input ports. For example, you can have one group of records from one stage input (port) and the other group from a second stage input (port 2), and the records will merge into a single record. If you delete a middle stage, the ports will not renumber consecutively.
You can specify which port should be preserved in cases where the input streams have fields of the same name. For example, if you are combining records from two streams, and both streams contain a field named AccountNumber, you could specify which stream's AccountNumber field you want to preserve by choosing the Record Combiner input port that corresponds to the stream you want to preserve. The data from the AccountNumber field in the other stream would be discarded.