普通X86服务器，Oracle数据库19C版本，非In-Memory Option，创建如下表格，并插入数据： create table test as select * from dba_objects; insert into test select * from dba_objects; insert into test select * from dba_objects; commit; 以下哪种索引创建方式以及后面的查询语句，可以使执行计划走"INDEX FAST FULL SCAN" ？(不要考虑其它复杂情况，多选题) A create index idx2_test on test(object_id,0); select count(*) from test; C create index idx2_test on test(object_id,0); select count(*) from test where object_id is not null; D create index idx1_test on test(object_id); select count(*) from test where object_id is not null; E create index idx2_test on test(object_id,0); select count(object_id) from test where object_id is null;