Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Having Ballista as part of the DataFusion codebase helps ensure that DataFusion remains suitable for distributed compute. 
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Should we update this part as Ballista has been a top-level repo ?

link: https://github.com/apache/arrow-datafusion/blob/master/docs/source/contributor-guide/roadmap.md?plain=1#L100-L102

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