In DSV1 this was pretty easy to do because of the burden of verification for writes had to be in the datasource, the new setup makes partial writes difficult.
resolveOuptutColumns checks the table schema against the writeplan's output and will fail any requests which don't contain every column as specified in the table schema. I would like it if instead if either we made this check optional for a datasource, perhaps an "allow partial writes" trait for the table? Or just allowed analysis to fail on "withInputDataSchema" where an implementer could throw exceptions on underspecified writes. The use case here is that C* (and many other sinks) have mandated columns that must be present during an insert as well as those which are not required. Please let me know if i've misread this, Thanks for your time again, Russ
