pub unsafe extern "C" fn Table_scope_and_contents_source_st_vers_check_system_fields(
this: *mut Table_scope_and_contents_source_st,
thd: *mut THD,
alter_info: *mut Alter_info,
table_name: *const Lex_table_name,
db: *const Lex_table_name,
select_count: c_int
) -> bool