  Code smells are symptoms of poor design quality. Since code review is a
process that also aims at improving code quality, we investigate whether and
how code review influences the severity of code smells. In this study, we
analyze more than 21,000 code reviews belonging to seven Java open-source
projects; we find that active and participated code reviews have a significant
influence on the likelihood of reducing the severity of code smells. This
result seems to confirm the expectations around code review's influence on code
quality. However, by manually investigating 365 cases in which the severity of
a code smell in a file was reduced with a review, we found that-in 95% of the
cases-the reduction was a side effect of changes that reviewers requested on
matters unrelated to code smells. Data and materials
[https://doi.org/10.5281/zenodo.3588501].
