spark git commit: [SPARK-16286][SQL] Implement stack table generating function

Repository: spark Updated Branches: refs/heads/branch-2.0 e32c29d86 -> 565e18cf7 [SPARK-16286][SQL] Implement stack table generating function This PR implements `stack` table generating function. Pass the Jenkins tests including new testcases. Author: Dongjoon Hyun

spark git commit: [SPARK-16286][SQL] Implement stack table generating function

Repository: spark Updated Branches: refs/heads/master fdde7d0aa -> d0d28507c [SPARK-16286][SQL] Implement stack table generating function ## What changes were proposed in this pull request? This PR implements `stack` table generating function. ## How was this patch tested? Pass the Jenkins