Feature request: Add option to allow column return null when role has no permission.

Hi, Team.

It would be nice to allow column return null when role does not has permission instead of throw validation error.

The issue names no files, tests, or entry points. Start by locating the validation that raises an error when a role lacks column permission, then determine the expected null behavior and its effects on the GraphQL schema and responses. Done means the behavior is specified, implemented, and covered by tests for permitted and unauthorized columns.

Written by the indexing model from the issue text.