message: fix scoping issue
diff: @@ -283,11 +283,13 @@ string_t UncompressedStringStorage::ReadOverflowString(ColumnSegment &segment, V
  offset += 2 * sizeof(uint32_t);
  data_ptr_t decompression_ptr;
  + std::unique_ptr<data_t[]> decompression_buffer;
  +
  // If string is in single block we decompress straight from it, else we copy first
  if (remaining <= Storage::BLOCK_SIZE - sizeof(block_id_t) - offset) {
  decompression_ptr = handle->node->buffer + offset;
  } else {
  - auto decompression_buffer = std::unique_ptr<data_t[]>(new data_t[compressed_size]);
  + decompression_buffer = std::unique_ptr<data_t[]>(new data_t[compressed_size]);
  auto target_ptr = decompression_buffer.get();
  // now append the string to the single buffer
  