[Backport] Improper equals override is fixed to prevent NullPointerException#7022

fjy merged 1 commit intoapache:0.14.0-incubatingapache/druid:0.14.0-incubatingfrom

clintropolis:backport-6938-to-0.14.0-incubatingclintropolis/druid:backport-6938-to-0.14.0-incubatingCopy head branch name to clipboard