Github user shivaram commented on the issue:
https://github.com/apache/spark/pull/14444
The easiest way to debug the R test case is to see what has changed for
this particular `select` query that is failing and then update the test case.
If you have compiled with `-Psparkr` then you can run `bin/sparkR` and just
paste in the following snippet which I've copied from the test case
```
df <- createDataFrame(list(list(1L, 2L, 3L), list(4L, 5L, 6L)),
schema = c("a", "b", "c"))
result <- collect(select(df, struct("a", "c")))
expected <- data.frame(row.names = 1:2)
expected$"struct(a, c)" <- list(listToStruct(list(a = 1L, c = 3L)),
listToStruct(list(a = 4L, c = 6L)))
```
Now you can just type `result` first and then `expected` and see how the
two differ. The test asserts that `result` should be equal to `expected`.
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