remove pruned columns dynamically using sdk
There is an ODBCLoader example (https://github.com/vertica/ODBC-Loader) that shows how to avoid fetching unused columns from the source system. But you still have to pass them filled with nulls through the Vertica SDK. Turns out it is very time-consuming too. If you query a single column out of external table with 20 columns it can be 10 times slower than fetching a single column out of external table with only one column.
Can you advise me if there is a way to avoid passing nulls for pruned columns out of UDParser?