spark git commit: [MINOR] Fix Java style errors and remove unused imports

Repository: spark Updated Branches: refs/heads/branch-2.0 5301efc17 -> 934e2aa4f [MINOR] Fix Java style errors and remove unused imports Fix Java style errors and remove unused imports, which are randomly found Tested on my local machine. Author: Xin Ren Closes #14161

spark git commit: [MINOR] Fix Java style errors and remove unused imports

Repository: spark Updated Branches: refs/heads/master f156136da -> f73891e0b [MINOR] Fix Java style errors and remove unused imports ## What changes were proposed in this pull request? Fix Java style errors and remove unused imports, which are randomly found ## How was this patch tested?