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