function based index in 9i require query_rewrite_enabled

I am looking at setting up a function based index. From the docs it states must set query_rewrite_enabled to true in order to use the index.  I had thought that setting this parameter was not required for 9i.      

Jeffrey Beckstrom
Database Administrator
Greater Cleveland Regional Transit Authority 1240 W. 6th Street
Cleveland, Ohio 44113

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