What is going wrong with `unionAll` of Spark `DataFrame`?

Question

Using Spark 1.5.0 and given the following code, I expect unionAll to union DataFrames based on their column name. In the code, I\'m using some FunSuite for pass

Answer 1

As discussed in SPARK-9813, it seems like as long as the data types and number of columns are the same across frames, the unionAll operation should work. Please see the comments for additional discussion.