bkietz commented on code in PR #38252:
URL: https://github.com/apache/arrow/pull/38252#discussion_r1363843832


##########
cpp/src/arrow/array/array_run_end_test.cc:
##########
@@ -543,8 +540,9 @@ TEST_P(TestRunEndEncodedArray, Validate) {
     malformed_array->data()->buffers.emplace_back(NULLPTR);
     EXPECT_RAISES_WITH_MESSAGE_THAT(
         Invalid,
-        ::testing::HasSubstr("Invalid: Values array invalid: Expected 2 
buffers in array "
-                             "of type int32, got 3"),
+        ::testing::HasSubstr(
+            "Invalid: Values array invalid: Invalid: Expected 2 buffers in 
array "
+            "of type int32, got 3"),

Review Comment:
   It is, but this is the format of other child array validation failures 
(since the parent array's error message contains the child array's). Possibly a 
follow up issue is in order to simplify those; I think it'd be most valuable to 
provide a field path to the child which failed validation and the "leaf" error 
message.



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