title: ADFv1 dependency problem for copy activity
body: <p>I have a single activity pipeline already in ADFv1 producing an AzureBlob dataset D1. Now I want to create either another dependent activity or another dependent pipeline (anything is fine) in such a way that the child activity will be a copy activity -- so it should only detect if D1 is Ready , and if it is , it should perform Blob to Blob copy operation but the source dataset won't be D1, it will be a different AzureBlob dataset altogether, call it Dx . So the status of D1 is only going to be used as a trigger point. How to do this? If I simple provide D1 as input to the copy activity, it will try to copy D1 data itself, which is not what I want -- it should detect the status of D1 and then start copying contents of Dx to target dataset of the copy activity.</p>