`column_specification` class is marked as "final": it's safe to use non-polymorphic pointer "lw_shared_ptr" instead of a more generic "shared_ptr". tests: unit(dev, debug) Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com> Message-Id: <20200427084016.26068-1-pa.solodovnikov@scylladb.com>