WillAyd commented on code in PR #48414:
URL: https://github.com/apache/arrow/pull/48414#discussion_r2619847303


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cpp/src/arrow/array/array_nested.h:
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@@ -720,8 +722,8 @@ class ARROW_EXPORT StructArray : public Array {
 
  private:
   // For caching boxed child data
-  // XXX This is not handled in a thread-safe manner.
-  mutable ArrayVector boxed_fields_;
+  struct ARROW_NO_EXPORT Impl;

Review Comment:
   Just curious by why is this required to use `ARROW_NO_EXPORT`?



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cpp/src/arrow/flight/transport/grpc/customize_grpc.h:
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@@ -20,6 +20,26 @@
 #include <limits>
 #include <memory>
 
+// HACK: Workaround absl::Mutex ABI incompatibility by making sure the

Review Comment:
   I had this same issue with the meson-python for pyarrow work. See 
https://github.com/apache/arrow/pull/48418 and related issue
   
   FWIW I could only replicate it using the conda compilers package. Pretty 
weird...needs more investigation



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