fix: EXPOSED-424 ClassCastException exception when using `fetchBatchedResults` with `alias`

[joc-a]

Added an additional check to see if the table is an alias and use the alias' delegate in that case.

I wanted to change the same logic in UpdateBuilder, but I couldn't think of a usage of the set functions where this change would be necessary. Please let me know if you think of a case where it is.