[CMT2][BUG] Migrate from interval_day_to_second to varchar, the data is not good

1 create table in oracle
CREATE TABLE "TEST"."INTERVALDAYTOSECOND_TYPE"
( "ID" NUMBER(*,0),
"IDTOS" INTERVAL DAY (2) TO SECOND (6)
) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "USERS" ;

2 Add data as attachment
3 Do migration

Actual result
+00 00:00:02.000000 became 0 2:0:0.0

Suggest it is same as source.