paul-rogers commented on issue #1829: DRILL-7096: Develop vector for canonical 
Map<K,V>
URL: https://github.com/apache/drill/pull/1829#issuecomment-515716369
 
 
   Looks like lots of work went into adapting the old-school complex readers 
and writers for this new type, but the newer column readers and writers don't 
have support. As a result, folks who want to use this feature need to use the 
old-style readers; the newer style "EVF" won't be usable for true maps.
   
   While undoubtedly this implementation is exactly what one particular use 
case needs; I do wonder at the wisdom of creating pools of partially supported 
features that reflect which sponsor pays for the work.
   
   Said another way, it would be very helpful, to encourage folks to create new 
readers, if the true map PR included EVF support.

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