save-buffer commented on code in PR #13143:
URL: https://github.com/apache/arrow/pull/13143#discussion_r882904638


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cpp/src/arrow/compute/exec/exec_plan.h:
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@@ -61,6 +61,18 @@ class ARROW_EXPORT ExecPlan : public 
std::enable_shared_from_this<ExecPlan> {
     return out;
   }
 
+  size_t GetThreadIndex();

Review Comment:
   I'd be fine with `uint32_t`. I just chose `size_t` because that's what 
`ThreadIndexer` currently returns. 



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