diff --git a/cpp/src/arrow/compute/light_array_test.cc b/cpp/src/arrow/compute/light_array_test.cc
index 3ee847080f00b..3d7d9ced83724 100644
--- a/cpp/src/arrow/compute/light_array_test.cc
+++ b/cpp/src/arrow/compute/light_array_test.cc
@@ -299,24 +299,24 @@ TEST(KeyColumnArray, SliceLargeBinary) {
       {0, 1, {"Hello"}},
       {1, 1, {"World"}},
       {2, 1, {"Slice"}},
-        {3, 1, {"Large"}},
-        {4, 1, {"Binary"}},
-        {5, 1, {"Test"}},
-        {0, 2, {"Hello", "World"}},
-        {1, 2, {"World", "Slice"}},
-        {2, 2, {"Slice", "Large"}},
-        {3, 2, {"Large", "Binary"}},
-        {4, 2, {"Binary", "Test"}},
-        {0, 3, {"Hello", "World", "Slice"}},
-        {1, 3, {"World", "Slice", "Large"}},
-        {2, 3, {"Slice", "Large", "Binary"}},
-        {3, 3, {"Large", "Binary", "Test"}},
-        {0, 4, {"Hello", "World", "Slice", "Large"}},
-        {1, 4, {"World", "Slice", "Large", "Binary"}},
-        {2, 4, {"Slice", "Large", "Binary", "Test"}},
-        {0, 5, {"Hello", "World", "Slice", "Large", "Binary"}},
-        {1, 5, {"World", "Slice", "Large", "Binary", "Test"}},
-        {0, 6, {"Hello", "World", "Slice", "Large", "Binary", "Test"}},
+      {3, 1, {"Large"}},
+      {4, 1, {"Binary"}},
+      {5, 1, {"Test"}},
+      {0, 2, {"Hello", "World"}},
+      {1, 2, {"World", "Slice"}},
+      {2, 2, {"Slice", "Large"}},
+      {3, 2, {"Large", "Binary"}},
+      {4, 2, {"Binary", "Test"}},
+      {0, 3, {"Hello", "World", "Slice"}},
+      {1, 3, {"World", "Slice", "Large"}},
+      {2, 3, {"Slice", "Large", "Binary"}},
+      {3, 3, {"Large", "Binary", "Test"}},
+      {0, 4, {"Hello", "World", "Slice", "Large"}},
+      {1, 4, {"World", "Slice", "Large", "Binary"}},
+      {2, 4, {"Slice", "Large", "Binary", "Test"}},
+      {0, 5, {"Hello", "World", "Slice", "Large", "Binary"}},
+      {1, 5, {"World", "Slice", "Large", "Binary", "Test"}},
+      {0, 6, {"Hello", "World", "Slice", "Large", "Binary", "Test"}},
   };
 
   for (const auto& testCase : testCases) {