alamb commented on issue #2816:
URL: 
https://github.com/apache/arrow-datafusion/issues/2816#issuecomment-1180309121

   > @alamb I just thought why Vec<Arc<LogicalPlan>>, can't we use 
Arc<Vec<LogicalPlan>> instead?
   
   I don't think there is any particular reason -- it may be for convenience in 
the codebase. 
   
   Note this ticket is describing the difference of the Union owning the 
`LogicalPlan` rather than a read-only shared copy (`Arc<LogicalPlan>`).
   
   


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