Add debug for Windows failures

Author: pitrou

cpp/src/arrow/util/rle_encoding_test.cc

@@ -998,6 +998,9 @@ void CheckRoundTrip(const Array& data, int bit_width, bool spaced, int32_t parts
   ASSERT_GE(parts, 1);
   ASSERT_LE(parts, data_size);
 
+  ARROW_SCOPED_TRACE("bit_width = ", bit_width, ", spaced = ", spaced, ", data_size = ", data_size,
+                     ", buffer_size = ", buffer_size);
+
   const value_type* data_values = static_cast<const ArrayType&>(data).raw_values();
 
   // Encode the data into `buffer` using the encoder.
@@ -1008,13 +1011,15 @@ void CheckRoundTrip(const Array& data, int bit_width, bool spaced, int32_t parts
     // Depending on `spaced` we treat nulls as regular values.
     if (data.IsValid(i) || !spaced) {
       bool success = encoder.Put(static_cast<uint64_t>(data_values[i]));
-      ASSERT_TRUE(success) << "Encoding failed in pos " << i;
+      ASSERT_TRUE(success) << "Encoding failed in pos " << i << ", current encoder len: " << encoder.len();
       ++encoded_values_size;
     }
   }
   int encoded_byte_size = encoder.Flush();
   ASSERT_EQ(encoded_values_size, data_values_count)
       << "All values input were not encoded successfully by the encoder";
+  ARROW_LOG(INFO) << "bit_width = " <<bit_width << ", data_size = " << data_size
+      << ", buffer size = " << buffer_size << ", encoded_byte_size = " << encoded_byte_size;
 
   // Now we verify batch read
   RleBitPackedDecoder<value_type> decoder(buffer.data(), encoded_byte_size, bit_width);