zanmato1984 commented on code in PR #43720:
URL: https://github.com/apache/arrow/pull/43720#discussion_r1721486888


##########
cpp/src/arrow/compute/kernels/aggregate_basic-inl.cc:
##########


Review Comment:
   Shall we make it a header file? I think it has the same effect as an 
include-only cc file.



##########
cpp/src/arrow/compute/kernels/aggregate_basic.cc:
##########
@@ -15,15 +15,29 @@
 // specific language governing permissions and limitations
 // under the License.
 
+#include <cassert>
+#include <cmath>
+#include <memory>
+#include <type_traits>
+#include <utility>
+
 #include "arrow/compute/api_aggregate.h"
 #include "arrow/compute/kernels/aggregate_basic_internal.h"
 #include "arrow/compute/kernels/aggregate_internal.h"
+#include "arrow/compute/kernels/codegen_internal.h"
 #include "arrow/compute/kernels/common_internal.h"
 #include "arrow/compute/kernels/util_internal.h"
+#include "arrow/type.h"
+#include "arrow/type_traits.h"
+#include "arrow/util/align_util.h"
+#include "arrow/util/bit_block_counter.h"
 #include "arrow/util/cpu_info.h"
+#include "arrow/util/decimal.h"
 #include "arrow/util/hashing.h"
 
-#include <memory>
+// Include templated definitions for aggregate kernels that must compiled here
+// with the SIMD level configured for this compilation unit in the build.
+#include "arrow/compute/kernels/aggregate_basic-inl.cc"  // NOLINT

Review Comment:
   Yes it is short for "inline".
   
   I think "-inl" (or similarly ".inl") is more commonly seen in other cpp 
projects than "_inline".
   
   Some examples:
   
https://github.com/google/googletest/blob/main/googletest/src/gtest-internal-inl.h
   https://github.com/facebook/folly/blob/main/folly/futures/Future-inl.h
   https://github.com/boostorg/thread/blob/master/test/util.inl



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