[GitHub] [arrow] rtpsw commented on a diff in pull request #14480: ARROW-18135: [C++] Avoid warnings that ExecBatch::length may be uninitialized

[GitBox <gi...@apache.org>]

rtpsw commented on code in PR #14480:
URL: https://github.com/apache/arrow/pull/14480#discussion_r1004481381


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cpp/src/arrow/compute/exec/exec_plan.cc:
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@@ -602,7 +602,9 @@ Future<std::vector<ExecBatch>> DeclarationToExecBatchesAsync(Declaration declara
       .Then([collected_fut, exec_plan]() -> Result<std::vector<ExecBatch>> {
         ARROW_ASSIGN_OR_RAISE(auto collected, collected_fut.result());
         return ::arrow::internal::MapVector(
-            [](std::optional<ExecBatch> batch) { return std::move(*batch); },
+            [](std::optional<ExecBatch> batch) {
+              return ARROW_PREDICT_TRUE(batch) ? std::move(*batch) : ExecBatch();

Review Comment:
   Does `value_or` use something like `ARROW_PREDICT_TRUE` underneath? Granted, the code changes here are not in performance-critical code, though they such code may follow the example set here. Bottom line, if you want the conciseness change, I'd be OK doing it.



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