When viewing the Indexes built on a Table, the Column name no longer displays if the operating system is v6r1 and above.
IBM changed the DATATYPE for field COLUMN_NAME in table SQLSTATISTICS to DBCLOB.
I believe the following SQL statement would work to show the COLUMN_NAME, regardless of operating version.
cast(COLUMN_NAME as varchar(128)) As COLUMN_NAME,
FROM SYSIBM . SQLSTATISTICS
WHERE TABLE_SCHEM = ?
AND TABLE_NAME = ?
ORDER BY 4 , 7 , 6 , 8