Teradata Equivalent to ORACLE UNPIVOT Command

[terrordata2]

Hello Teradata Experts,

The following query was posted in the Teradata Forum back in 2010, but it didn't receive any replies. I am attempting to do exactly the same thing as part of a large Data Conversion Exercise (25 Tables, 40 Columns per Table). If it could also be done using a Stored Procedure - that would be ideal. Let's assume that I only know the name of the KEY Column - but not any of the others. Note that I do not want to use UNION ALL.
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To convert the columns to rows , I was trying UNPIVOT in Oracle 11g like given below

KEY C1 C2 C3
--- ----- ----- -----
r1 v1 v2 v3
r2 v1 v2
r3 v1 v3
r4 v1
r5 v2 v3
r6 v2
r7 v3
r8


select key, source, val
from
t UNPIVOT INCLUDE NULLS
( VAL FOR( SOURCE ) IN
( C1 AS 'C1',
C2 AS 'C2',
C3 AS 'C3'
)
)
order by key, source ;


Do we have any function in Teradata like UNPIVOT to achieve the same results ( without using union all) ?