This bug: https://github.com/apache/incubator-druid/issues/7423 was found thanks to PVS-Studio. Developers of Druid are recommended to obtain an open-source license of PVS-Studio and run the analysis from time to time. It works as a plugin for IntelliJ.
See https://www.viva64.com/en/b/0600/ https://www.viva64.com/en/open-source-license/
