test_truncate24 has both row-store (key_format='i') and column-store (key_format='r') scenarios, but does not skip the column-store variant when run under the disagg hook. Disaggregated storage does not support column-store (hook_disagg leaves column-store tables non-layered), and running the var.* scenarios under disagg can produce slow tree walks / spurious failures.

Follow the canonical pattern used in test_stat10.py:

def test_truncate24(self):
    if self.runningHook('disagg') and self.key_format == 'r':
        self.skipTest("disagg does not support column-store")
    ...