GitHub user mn-mikke opened a pull request: https://github.com/apache/spark/pull/22471
[SPARK-25470][SQL][Performance] Concat.eval should use pattern matching only once ## What changes were proposed in this pull request? The PR proposes a solution for a problem described [here](https://github.com/apache/spark/pull/20858#discussion_r218677837). ## How was this patch tested? Run the existing tests for Concat expression. You can merge this pull request into a Git repository by running: $ git pull https://github.com/mn-mikke/spark SPARK-25470 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/22471.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 #22471 ---- commit 9051c235eb2e4a62293ea6bd55e9d7aa1cb096fe Author: Marek Novotny <mn.mikke@...> Date: 2018-09-19T17:49:15Z [SPARK-25470][SQL][Performance] Concat.eval will use pattern matching only once ---- --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org