zeroshade commented on code in PR #34079:
URL: https://github.com/apache/arrow/pull/34079#discussion_r1101669549


##########
go/arrow/array/util.go:
##########
@@ -440,6 +440,23 @@ func (n *nullArrayFactory) create() *Data {
                        childData[i] = n.createChild(dt, i, n.len)
                        defer childData[i].Release()
                }
+       case *arrow.RunEndEncodedType:
+               bldr := NewBuilder(n.mem, dt.RunEnds())
+               defer bldr.Release()
+
+               switch b := bldr.(type) {
+               case *Int16Builder:
+                       b.Append(int16(n.len))
+               case *Int32Builder:
+                       b.Append(int32(n.len))
+               case *Int64Builder:
+                       b.Append(int64(n.len))
+               }
+
+               childData[0] = bldr.newData()
+               defer childData[0].Release()
+               childData[1] = n.createChild(dt.Encoded(), 1, 1)
+               defer childData[1].Release()

Review Comment:
   yea, i just wanted to also update `MakeArrayOfNull` since it's "connected" 
but not directly related.



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