Github user aray commented on the issue:
https://github.com/apache/spark/pull/16161
Right now it's not supported to have the following:
```
case class Foo(a: Map[Int, Int])
```
(using the scala Predef version of Map)
The
[documented](http://spark.apache.org/docs/latest/sql-programming-guide.html#data-types)
way to do this is:
```
case class Foo(a: scala.collections.Map[Int, Int])
```
and it works fine.
However if someone did not read the documentation carefully and used the
former, instead of a reasonable error they get a compile error on the code
spark generates. Therefore IMHO there are two options:
1. Make the generated code work with either version of Map (this PR)
2. Intercept definitions that use the wrong version of Map and issue a
proper error.
If the consensus is that this PR is not worth it then I'll be happy to work
on option 2. But in my opinion as a Spark user option 1 is better.
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