zeroshade commented on code in PR #13806:
URL: https://github.com/apache/arrow/pull/13806#discussion_r940352533


##########
go/arrow/internal/arrjson/arrjson_test.go:
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@@ -5085,3 +5086,352 @@ func makeExtensionsWantJSONs() string {
   ]
 }`
 }
+
+func makeUnionWantJSONs() string {

Review Comment:
   The top level validity of a union array should always be all 1's (since the 
top level validity bitmap is always left out for a union array). But i can 
definitely make some of the children entries null.



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