Livy interpreter Scala code string interpolation

[Tan, Jialiang]

Hi,

When writing Spark Scala code in zeppelin with Livy interpreter, string 
interpolation does not seem to work. For example:

val devices = sc.objectFile[(VertexId, DeviceAttr)](
s"s3a://${bucket}/${datasetS3Prefix}/${tableName} 
/dt=${end_dt}/tid=${tid}/${datasetS3Suffix}")

I think the dollar curly brackets were interpreted as Javascript template 
literals and hence disappear when Livy server gets the message and becomes:

val devices = sc.objectFile[(VertexId, DeviceAttr)](
   s"s3a://///dt= /tid= / ")

At the same time a couple of input boxes appears at the bottom of this 
paragraph in Zeppelin UI having the corresponding titles in the original dollar 
curly brackets.

Is this a bug? How can we overcome the string interpolation issue?

Thanks,
Jialiang