spark git commit: [SPARK-21042][SQL] Document Dataset.union is resolution by position

2017-06-09 Thread rxin
Repository: spark Updated Branches: refs/heads/branch-2.2 869af5bcb -> 815a0820b [SPARK-21042][SQL] Document Dataset.union is resolution by position ## What changes were proposed in this pull request? Document Dataset.union is resolution by position, not by name, since this has been a

spark git commit: [SPARK-21042][SQL] Document Dataset.union is resolution by position

2017-06-09 Thread rxin
Repository: spark Updated Branches: refs/heads/master 571635488 -> b78e3849b [SPARK-21042][SQL] Document Dataset.union is resolution by position ## What changes were proposed in this pull request? Document Dataset.union is resolution by position, not by name, since this has been a confusing