westonpace commented on a change in pull request #9323:
URL: https://github.com/apache/arrow/pull/9323#discussion_r580699988



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File path: cpp/src/arrow/compute/kernels/vector_hash.cc
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@@ -147,6 +152,8 @@ class ValueCountsAction final : ActionBase {
     }
   }
 
+  bool ShouldEncodeNulls() { return true; }

Review comment:
       This appears to fail on GCC 6.3.  See 
https://github.com/apache/arrow/pull/9323/checks?check_run_id=1956850616 and 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66297
   
   Suggestions?




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