lidavidm commented on pull request #11466:
URL: https://github.com/apache/arrow/pull/11466#issuecomment-947104517


   Ah, thanks for the reference.
   
   For ArraySubscript: is that row-wise indexing or column-wise? It sounds like 
ArraySubscript is row-wise (you have a ListArray and want the ith row). And 
ArraySlice is ARROW-12669 (the list_element kernel).
   
   MapKey: specifically, this sounds like extracting the value of a particular 
key for each slot of a MapArray? I think this could be handled, but doesn't 
quite fit with FieldRef here, and might also make sense as a kernel instead. 
Indeed there's this check here: 
https://github.com/apache/arrow/blob/c3b7c963c8d77d7d0c916003aee6b1aedd78b870/cpp/src/arrow/type.cc#L1059-L1064


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