GitHub user dbtsai opened a pull request: https://github.com/apache/spark/pull/21904
[SPARK-24953] [SQL] Prune a branch in `CaseWhen` if previously seen ## What changes were proposed in this pull request? If a condition in a branch is previously seen, this branch can be pruned. If the outputs of two adjacent branches are the same, two branches can be combined. ## How was this patch tested? Tests added. You can merge this pull request into a Git repository by running: $ git pull https://github.com/dbtsai/spark prune-case-when-branch Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/21904.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #21904 ---- commit 4ac3d1efdec05d56f5051901ca209b67b23be28b Author: DB Tsai <d_tsai@...> Date: 2018-07-27T23:47:02Z prune casewhen branch ---- --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org