Actual Column Name for Index when Function is used?

Hi,
We have some indeces where the column in oracle is actually a function in the form UPPER('column-name'). When I query user_ind_columns I get something like SYS_NC0012$ for the column name. Where would I be able to actually query the actual column it's using in the index? So that I can query the exact column name if need be. Don't ask why cause this is a developer asking me this and they are doing some sort of a comparison between indexes between two application.
Here is the SQL for the Index and the Table associated with it
create table BATCH_HEADER2
PAYMENT_TYPE VARCHAR2(17),
BATCH_TYPE VARCHAR2(40) not null,
BATCHNUM NUMBER not null,
BRANCH VARCHAR2(16),
BATCH_TIME NUMBER,
USER_LOB VARCHAR2(16),
PAYEE_TYPE VARCHAR2(40),
PROGRESS_RECID NUMBER,
CHEQUE_TYPE VARCHAR2(60),
SCANNERBATCHNO NUMBER,
RECEIPTCOUNT NUMBER
alter table BATCH_HEADER2
add constraint PK_BATCH_HEADER2 primary key (BATCH_TYPE, BATCHNUM)
using index
tablespace FT1_DATA;
--Inxes
create unique index FT1DSTINT.BATCH_HEADER2##BYNUM on FT1DSTINT.BATCH_HEADER2 (UPPER(BATCH_TYPE), BATCHNUM)
tablespace FT1_DATA
pctfree 10
initrans 2
maxtrans 255
storage (initial 64K
minextents 1
maxextents unlimited);

From Oracle's standpoint, though, it isn't indexing BATCH_TYPE. It's indexing an arbitrary function that happens to take BATCH_TYPE as an input. As far as Oracle is concerned, you might just as easily be indexing an expression that took a dozen column names as parameters, so it doesn't really make sense for Oracle to try to break down anything beyond the function.
Of course, you could always parse the expression and extract the column name, but I would be dubious that's the right answer... If a developer is comparing indexes between columns, there is a heck of a lot of difference between an index on BATCH_TYPE, and index on UPPER(BATCH_TYPE) and an index on SOME_OTHER_FUNCTION( BATCH_TYPE ).
Justin

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