I use create type [name] is object or type [name] record method . but Return different results? - oracle

Question

I've been wondering what's wrong.
There are too many data in my table. I can't get them all out
In the 3 sql statements, the other parameters and conditions are the same except that [ t1 ] uses three different methods.
1.Mode1 is Physical table.
2.Mode2 is Create type Object.
3.Mode3 is type Record.
enter image description here
Table t1 has 900000 data.
Oracle database 12c Enterprice 12.1.0.2.0
Result:
I got an incredible result.
1. Mode 1 Result (Physical table) = Mode3 Result（Record Mode）.
2. Mode2 Result(Object Mode) != (Mode1 or Mode3).
code:
1. create or replace type o_record is object ( a1 varchar2(100) ,a2 number ,a3 varchar2(50) );
2.creae or reaplce type o_table is table of o_record ;
In package space :
type r_record is record (a1 varchar2(100) , a2 number ,a3 varchar2(50) );
type r_table is table of r_record ;
r_record_mode r_table ;
In package Body:
create or reaplce package body test is
procedure main ( result1 out number
,result2 out number
,result3 out number
,para in number
) is
o_object_mode o_table ;
------------------------------------------------------------------
cursor cur_a1 is
select count(1) num
from **table1 t1** , -- Physical table (Mode 1)
table2 t2.....
where t1.a1=t2.a1
and t1.a2=nvl(para,t1.a2)
....
;
cursor cur_a2 is
select count(1) num
from **table( o_object_mode ) t1**, ; --Object (Mode2)
table2 t2.....
where t1.a1=t2.a1
and t1.a2=nvl(para,t1.a2)
....
;
cursor cur_a3 is
select count(1) num
from **table( t_record_mode ) t1**, --Record (Mode3)
table2 t2.....
where t1.a1=t2.a1
and t1.a2=nvl(para,t1.a2)
....
------------------------------------------------------------------
begin
select o_record ( t.a1 ,t.a2 ,t.a3 )
bulk collect
into o_object_mode
from table1 t
;
------------------------------------------------------------------
select t.a1 ,t.a2 ,t.a3
bulk collect
into r_record_mode
from table1 t
;
------------------------------------------------------------------
for i in cur_a1 loop
result1 :=i.num;
end loop;
--------------------------
for i in cur_a2 loop
result2 :=i.num;
end loop;
--------------------------
for i in cur_a3 loop
result3 :=i.num;
end loop;
------------------------------------------------------------------
end main;
end test ;
I can get the correct result by replacing [type object] with [type record].
It is so difficult that [type object] needs special attention and usage