Add low-level logs

Author: pitrou

ci/scripts/python_wheel_windows_test.bat

@@ -59,4 +59,4 @@ py -0p
 %PYTHON_CMD% C:\arrow\ci\scripts\python_wheel_validate_contents.py --path C:\arrow\python\repaired_wheels || exit /B 1
 
 @REM Execute unittest
-%PYTHON_CMD% -m pytest -r s --pyargs pyarrow || exit /B 1
+%PYTHON_CMD% -m pytest -r s --pyargs pyarrow.tests.test_compute || exit /B 1

cpp/src/arrow/compute/kernels/copy_data_internal.h

@@ -30,13 +30,15 @@ template <>
 struct CopyDataUtils<BooleanType> {
   static void CopyData(const DataType&, const Scalar& in, const int64_t in_offset,
                        uint8_t* out, const int64_t out_offset, const int64_t length) {
+    ARROW_LOG(INFO) << "Boolean CopyData from Scalar to offset " << out_offset << " with length " << length;
     bit_util::SetBitsTo(
         out, out_offset, length,
         in.is_valid ? checked_cast<const BooleanScalar&>(in).value : false);
   }
 
   static void CopyData(const DataType&, const uint8_t* in, const int64_t in_offset,
                        uint8_t* out, const int64_t out_offset, const int64_t length) {
+    ARROW_LOG(INFO) << "Boolean CopyData from Array at offset " << in_offset << " to offset " << out_offset << " with length " << length;
     arrow::internal::CopyBitmap(in, in_offset, length, out, out_offset);
   }
 
@@ -91,11 +93,13 @@ struct CopyDataUtils<
                        uint8_t* out, const int64_t out_offset, const int64_t length) {
     CType* begin = reinterpret_cast<CType*>(out) + out_offset;
     CType* end = begin + length;
+    ARROW_LOG(INFO) << "CopyData from Scalar to offset " << out_offset << " with length " << length;
     std::fill(begin, end, UnboxScalar<Type>::Unbox(in));
   }
 
   static void CopyData(const DataType&, const uint8_t* in, const int64_t in_offset,
                        uint8_t* out, const int64_t out_offset, const int64_t length) {
+    ARROW_LOG(INFO) << "CopyData from Array at offset " << in_offset << " to offset " << out_offset << " with length " << length;
     std::memcpy(out + out_offset * sizeof(CType), in + in_offset * sizeof(CType),
                 length * sizeof(CType));
   }