CONNECT BY, Performance problems with hierarchical SQL

Hello,
I have a performance problem with the following SQL:
table name: testtable
columns: colA, colB, colC, colD, colE, colF
Following hierarchical SQL:
SELECT colA||colB||colC AS A1, colD||colE||colF AS B1, colA, colB, colC, level
FROM testable
CONNECT BY PRIOR A1 = B1
START WITH A1 = 'aaa||bbbb||cccc'
With big tables the performance of this construct is very bad. I can't use functional based indexes to create an Index on "colA||colB||colC" and "colD||colE||colF"
Has anyone an idea how I can get a real better performance for this hierarchical construct, if I have to combine multiple colums? Or is there any better way (with an PL/SQL or view trigger) solve something like this ??
Thanks in advance for your investigation :)
Carmen

Why not
CONNECT BY PRIOR colA = colD
and PRIOR colB = colE
and ...
? It is not the same thing, but I suspect my version is correct:-)

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CONNECT BY, Performance problems with hierarchical SQL

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