GitHub user dbtsai opened a pull request: https://github.com/apache/spark/pull/21852
[SPARK-24893] [SQL] Remove the entire CaseWhen if all the outputs are semantic equivalence ## What changes were proposed in this pull request? Similar to SPARK-24890, if all the outputs of `CaseWhen` are semantic equivalence, `CaseWhen` can be removed. ## 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 short-circuit-when Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/21852.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 #21852 ---- commit dc8de5fec6efc723ce01bcbaf0496c57b62e0ba2 Author: DB Tsai <d_tsai@...> Date: 2018-07-23T19:15:58Z remove casewhen if possible ---- --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org