cocoa-xu commented on code in PR #507:
URL: https://github.com/apache/arrow-nanoarrow/pull/507#discussion_r1628051290


##########
src/nanoarrow/array_inline.h:
##########
@@ -661,6 +661,44 @@ static inline ArrowErrorCode 
ArrowArrayFinishElement(struct ArrowArray* array) {
         }
       }
       break;
+
+    case NANOARROW_TYPE_RUN_END_ENCODED:
+      if (array->children[0]->length != array->children[1]->length) {
+        return EINVAL;
+      }
+      if (array->children[0]->null_count != 0) {
+        return EINVAL;
+      }
+      array->length = 0;
+      struct ArrowBuffer* data_buffer;
+      data_buffer = ArrowArrayBuffer(array->children[0], 1);
+      for (int64_t i = 0; i < array->children[0]->length; i++) {

Review Comment:
   > Perhaps for this PR the helper could be omitted and we can learn from the 
experience of implementing this elsewhere what the best intervention would be?
   
   No problem, I've removed it :)



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