Oracle Hint not causing any change to explain plan

Hi,
I was facing a problem about ORA-00600 for using Connect by Prior query,
details of which are at -
Connect by Prior - ORA-00600: internal error code, arguments: [kkqcbydrv:1
As is documented by Oracle, workaround for this is to use /*+ NO_UNNEST */ in query.
I displayed the explain plan for original query and after putting hint in query.
There is no difference in the explain plans, I am a starter for explain plans and don't know much of it.
But shouldn't the hint cause some change in explain plan?
Even the hash values as mentioned in explain plans are same.
Thanks in advance.
Av.

Perhaps it would help if you put the query (with the hint) and the explain plan here.

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Simon:
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2     AFTER INSERT OR UPDATE ON t
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Oracle Hint not causing any change to explain plan

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