Thanks for the valuable feedback, Leonard. I have discussed with Leonard off-line. We have reached some conclusions about these issues and I have updated the FLIP as follows:
1. Simplify the `LineageEdge` interface by creating an edge from one source vertex to sink vertex. 2. Remove the `TableColumnSourceLineageVertex` interface and update `TableColumnLineageEdge` to create an edge from columns in one source to each sink column. 3. Rename `SupportsLineageVertex` to `LineageVertexProvider` 4. Add method `addLineageEdges(LineageEdge ... edges)` in `StreamExecutionEnviroment` for datastream job and remove previous methods in `DataStreamSource` and `DataStreamSink`. Looking forward to your feedback, thanks. Best, Shammon FY
